Make improvements

- Emulator can now test the αcτµαlly pδrταblε εxεcµταblε bootloader

- Whipped up a webserver named redbean. It services 150k requests per
  second on a single core. Bundling assets inside zip enables extremely
  fast serving for two reasons. The first is that zip central directory
  lookups go faster than stat() system calls. The second is that both
  zip and gzip content-encoding use DEFLATE, therefore, compressed
  responses can be served via the sendfile() system call which does an
  in-kernel copy directly from the zip executable structure. Also note
  that red bean zip executables can be deployed easily to all platforms,
  since these native executables work on Linux, Mac, BSD, and Windows.

- Address sanitizer now works very well

tool/build/lib/address.h

@@ -0,0 +1,28 @@
+#ifndef COSMOPOLITAN_TOOL_BUILD_LIB_ADDRESS_H_
+#define COSMOPOLITAN_TOOL_BUILD_LIB_ADDRESS_H_
+#include "libc/assert.h"
+#include "third_party/xed/x86.h"
+#include "tool/build/lib/machine.h"
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+uint64_t AddressDi(struct Machine *, uint32_t);
+uint64_t AddressSi(struct Machine *, uint32_t);
+uint64_t DataSegment(struct Machine *, uint32_t, uint64_t);
+uint64_t AddSegment(struct Machine *, uint32_t, uint64_t, uint8_t[8]);
+uint8_t *GetSegment(struct Machine *, uint32_t, int) nosideeffect;
+
+forceinline uint64_t MaskAddress(uint32_t mode, uint64_t x) {
+  if (mode != XED_MODE_LONG) {
+    if (mode == XED_MODE_REAL) {
+      x &= 0xffff;
+    } else {
+      x &= 0xffffffff;
+    }
+  }
+  return x;
+}
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_TOOL_BUILD_LIB_ADDRESS_H_ */