[FMV][AArch64] Remove last of MRS bits and rename file (llvm#161585)

474f5d2 removed the last
bits reading from system registers so remove the last bits
utilizing MRS and rename the file to hwcap as the
code is now only decoding the hwcap flags.

Author: brad0

compiler-rt/lib/builtins/cpu_model/aarch64.c

@@ -69,15 +69,15 @@ struct {
 #if defined(__APPLE__)
 #include "aarch64/fmv/apple.inc"
 #elif defined(__FreeBSD__) || defined(__OpenBSD__)
-#include "aarch64/fmv/mrs.inc"
+#include "aarch64/fmv/hwcap.inc"
 #include "aarch64/fmv/elf_aux_info.inc"
 #elif defined(__Fuchsia__)
 #include "aarch64/fmv/fuchsia.inc"
 #elif defined(__ANDROID__)
-#include "aarch64/fmv/mrs.inc"
+#include "aarch64/fmv/hwcap.inc"
 #include "aarch64/fmv/android.inc"
 #elif defined(__linux__) && __has_include(<sys/auxv.h>)
-#include "aarch64/fmv/mrs.inc"
+#include "aarch64/fmv/hwcap.inc"
 #include "aarch64/fmv/getauxval.inc"
 #elif defined(_WIN32)
 #include "aarch64/fmv/windows.inc"

compiler-rt/lib/builtins/cpu_model/aarch64/fmv/mrs.inc renamed to compiler-rt/lib/builtins/cpu_model/aarch64/fmv/hwcap.inc

@@ -7,9 +7,6 @@ static void __init_cpu_features_constructor(unsigned long hwcap,
                                             const __ifunc_arg_t *arg) {
   unsigned long long feat = 0;
 #define setCPUFeature(F) feat |= 1ULL << F
-#define getCPUFeature(id, ftr) __asm__("mrs %0, " #id : "=r"(ftr))
-#define extractBits(val, start, number)                                        \
-  (val & ((1ULL << number) - 1ULL) << start) >> start
   unsigned long hwcap2 = 0;
   if (hwcap & _IFUNC_ARG_HWCAP)
     hwcap2 = arg->_hwcap2;