Make improvements

- Introduce portable sched_getcpu() api
- Support GCC's __target_clones__ feature
- Make fma() go faster on x86 in default mode
- Remove some asan checks from core libraries
- WinMain() now ensures $HOME and $USER are defined

libc/nexgen32e/rdtscp.h

@@ -5,7 +5,7 @@
 #include "libc/nexgen32e/x86feature.h"
 COSMOPOLITAN_C_START_
 
-#define TSC_AUX_CORE(MSR) ((MSR)&0xfff)
+#define TSC_AUX_CORE(MSR) ((MSR) & 0xfff)
 #define TSC_AUX_NODE(MSR) (((MSR) >> 12) & 0xfff)
 
 /**
@@ -41,9 +41,10 @@ COSMOPOLITAN_C_START_
       asm volatile("rdpid\t%0" : "=r"(Msr) : /* no inputs */ : "memory"); \
       Ok = true;                                                          \
     } else if (IsLinux()) {                                               \
+      char *p = (char *)0x7b;                                             \
       asm volatile(ZFLAG_ASM("lsl\t%2,%1")                                \
                    : ZFLAG_CONSTRAINT(Ok), "=r"(Msr)                      \
-                   : "r"(0x7b)                                            \
+                   : "r"(p)                                               \
                    : "memory");                                           \
     }                                                                     \
     if (!Ok && X86_HAVE(RDTSCP)) {                                        \