Delete ASAN

It hasn't been helpful enough to be justify the maintenance burden. What
actually does help is mprotect(), kprintf(), --ftrace and --strace which
can always be counted upon to work correctly. We aren't losing much with
this change. Support for ASAN on AARCH64 was never implemented. Applying
ASAN to the core libc runtimes was disabled many months ago. If there is
some way to have an ASAN runtime for user programs that is less invasive
we can potentially consider reintroducing support. But now is premature.

test/libc/log/backtrace_test.c

@@ -21,7 +21,6 @@
 #include "libc/dce.h"
 #include "libc/errno.h"
 #include "libc/fmt/conv.h"
-#include "libc/intrin/asan.internal.h"
 #include "libc/limits.h"
 #include "libc/log/libfatal.internal.h"
 #include "libc/log/log.h"
@@ -86,10 +85,6 @@ TEST(ShowCrashReports, testMemoryLeakCrash) {
   ssize_t rc;
   int ws, pid, fds[2];
   char *output, buf[512];
-  if (!IsAsan()) {
-    /* TODO(jart): How can we make this work without ASAN? */
-    return;
-  }
   ASSERT_NE(-1, pipe2(fds, O_CLOEXEC));
   ASSERT_NE(-1, (pid = fork()));
   if (!pid) {
@@ -254,53 +249,6 @@ TEST(ShowCrashReports, testDivideByZero) {
   free(output);
 }
 
-// clang-format off
-//
-// test/libc/log/backtrace_test.c:59: ubsan error: 'int' index 10 into 'char [10]' out of bounds
-// 0x000000000040a352: __die at libc/log/die.c:40
-// 0x0000000000489bc8: __ubsan_abort at libc/intrin/ubsan.c:196
-// 0x0000000000489e1c: __ubsan_handle_out_of_bounds at libc/intrin/ubsan.c:242
-// 0x0000000000423666: BssOverrunCrash at test/libc/log/backtrace_test.c:59
-// 0x0000000000423e0a: SetUp at test/libc/log/backtrace_test.c:115
-// 0x000000000049350b: testlib_runtestcases at libc/testlib/testrunner.c:98
-// 0x000000000048ab50: testlib_runalltests at libc/testlib/runner.c:37
-// 0x00000000004028d0: main at libc/testlib/testmain.c:94
-// 0x0000000000403977: cosmo at libc/runtime/cosmo.S:69
-// 0x00000000004021ae: _start at libc/crt/crt.S:78
-//
-// asan error: global redzone 1-byte store at 0x00000048cf2a shadow 0x0000800899e5
-//                                         x
-// ........................................OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
-//       |0      |0      |0      |0      |2      |-6     |-6     |-6     |-6
-//                                ☺☻♥♦♣♠•◘○                                        
-// 000000400000-000000460000 .text
-// 000000460000-000000468000 .data
-// 00007fff0000-00008000ffff
-// 000080070000-00008009ffff ←shadow
-// 02008fff0000-02009001ffff
-// 020090060000-02009007ffff
-// 0e007ffb0000-0e008000ffff
-// 1000286b0000-1000286cffff
-// 100080000000-10008009ffff
-// 100080350000-10008036ffff
-// 100080380000-10008038ffff
-// 6fffffe00000-6fffffffffff
-// 0x0000000000407af6: __die at libc/log/die.c:36
-// 0x0000000000444f13: __asan_die at libc/intrin/asan.c:318
-// 0x0000000000445bc8: __asan_report at libc/intrin/asan.c:667
-// 0x0000000000445e41: __asan_report_memory_fault at libc/intrin/asan.c:672
-// 0x0000000000446312: __asan_report_store at libc/intrin/asan.c:1008
-// 0x0000000000444442: __asan_report_store1 at libc/intrin/somanyasan.S:118
-// 0x0000000000416216: BssOverrunCrash at test/libc/log/backtrace_test.c:52
-// 0x000000000041642a: SetUp at test/libc/log/backtrace_test.c:73
-// 0x00000000004513eb: testlib_runtestcases at libc/testlib/testrunner.c:98
-// 0x000000000044bbe0: testlib_runalltests at libc/testlib/runner.c:37
-// 0x00000000004026db: main at libc/testlib/testmain.c:155
-// 0x000000000040323f: cosmo at libc/runtime/cosmo.S:64
-// 0x000000000040219b: _start at libc/crt/crt.S:67
-//
-// clang-format on
-
 TEST(ShowCrashReports, testBssOverrunCrash) {
   if (!IsAsan()) return;
   size_t got;
@@ -348,78 +296,6 @@ TEST(ShowCrashReports, testBssOverrunCrash) {
   free(output);
 }
 
-// clang-format off
-// asan error: null pointer dereference 1-byte load at 0x000000000000 shadow 0x00007fff8000
-//                                         x
-// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅∅
-// |-17    |-17    |-17    |-17    |-17    |-1     |-1     |-1     |-1     |-1
-// ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅
-// 000000400000-000000464000 .text
-// 000000464000-00000046d000 .data
-// 00007fff0000-00008000ffff ←shadow
-// 000080070000-00008009ffff
-// 02008fff0000-02009001ffff
-// 020090060000-02009007ffff
-// 0e007fff0000-0e008000ffff
-// 10000d3e0000-10000d3fffff
-// 100080000000-10008009ffff
-// 100080370000-10008038ffff
-// 1000803a0000-1000803affff
-// 6ffffffe0000-6fffffffffff
-// 0x0000000000407c84: __die at libc/log/die.c:37
-// 0x000000000040b1ee: __asan_report_load at libc/intrin/asan.c:1083
-// 0x000000000041639e: NpeCrash at test/libc/log/backtrace_test.c:87
-// 0x0000000000416733: SetUp at test/libc/log/backtrace_test.c:120
-// 0x00000000004541fb: testlib_runtestcases at libc/testlib/testrunner.c:98
-// 0x000000000044d000: testlib_runalltests at libc/testlib/runner.c:37
-// 0x00000000004026db: main at libc/testlib/testmain.c:94
-// 0x000000000040327f: cosmo at libc/runtime/cosmo.S:64
-// 0x000000000040219b: _start at libc/crt/crt.S:67
-// clang-format on
-TEST(ShowCrashReports, testNpeCrash) {
-  if (!IsAsan()) return;
-  size_t got;
-  ssize_t rc;
-  int ws, pid, fds[2];
-  char *output, buf[512];
-  ASSERT_NE(-1, pipe2(fds, O_CLOEXEC));
-  ASSERT_NE(-1, (pid = fork()));
-  if (!pid) {
-    dup2(fds[1], 1);
-    dup2(fds[1], 2);
-    execv("bin/backtrace", (char *const[]){"bin/backtrace", "7", 0});
-    _Exit(127);
-  }
-  close(fds[1]);
-  output = 0;
-  appends(&output, "");
-  for (;;) {
-    rc = read(fds[0], buf, sizeof(buf));
-    if (rc == -1) {
-      ASSERT_EQ(EINTR, errno);
-      continue;
-    }
-    if ((got = rc)) {
-      appendd(&output, buf, got);
-    } else {
-      break;
-    }
-  }
-  close(fds[0]);
-  ASSERT_NE(-1, wait(&ws));
-  // tinyprint(2, gc(IndentLines(output, -1, 0, 4)), "\n", NULL);
-  EXPECT_EQ(77 << 8, ws);
-  /* NULL is stopgap until we can copy symbol tables into binary */
-  ASSERT_TRUE(!!strstr(output, "null pointer"));
-#ifdef __FNO_OMIT_FRAME_POINTER__
-  ASSERT_TRUE(OutputHasSymbol(output, "NpeCrash"));
-#endif
-  if (!strstr(output, "null pointer access")) {  // ubsan
-    ASSERT_TRUE(!!strstr(output, "∅∅∅∅"));       // asan
-  }
-  free(output);
-}
-
 TEST(ShowCrashReports, testDataOverrunCrash) {
   if (!IsAsan()) return;
   size_t got;