[builtins][AArch64] Clean up the sys/auxv.h header handling (llvm#161751)

glibc 2.17 added AArch64 support and already had getauxval().

Author: brad0

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

@@ -32,26 +32,29 @@ typedef struct __ifunc_arg_t {
 _Bool __aarch64_have_lse_atomics
     __attribute__((visibility("hidden"), nocommon)) = false;
 
+// The formatter wants to re-order these includes, but doing so is incorrect:
+// clang-format off
 #if defined(__FreeBSD__) || defined(__OpenBSD__)
-// clang-format off: should not reorder sys/auxv.h alphabetically
 #include <sys/auxv.h>
-// clang-format on
 #include "aarch64/hwcap.inc"
 #include "aarch64/lse_atomics/elf_aux_info.inc"
 #elif defined(__Fuchsia__)
 #include "aarch64/hwcap.inc"
 #include "aarch64/lse_atomics/fuchsia.inc"
 #elif defined(__ANDROID__)
+#include <sys/auxv.h>
 #include "aarch64/hwcap.inc"
 #include "aarch64/lse_atomics/android.inc"
-#elif defined(__linux__) && __has_include(<sys/auxv.h>)
+#elif defined(__linux__)
+#include <sys/auxv.h>
 #include "aarch64/hwcap.inc"
 #include "aarch64/lse_atomics/getauxval.inc"
 #elif defined(_WIN32)
 #include "aarch64/lse_atomics/windows.inc"
 #else
 // When unimplemented, we leave __aarch64_have_lse_atomics initialized to false.
 #endif
+// clang-format on
 
 #if !defined(DISABLE_AARCH64_FMV)
 
@@ -74,7 +77,7 @@ struct {
 #elif defined(__ANDROID__)
 #include "aarch64/fmv/hwcap.inc"
 #include "aarch64/fmv/android.inc"
-#elif defined(__linux__) && __has_include(<sys/auxv.h>)
+#elif defined(__linux__)
 #include "aarch64/fmv/hwcap.inc"
 #include "aarch64/fmv/getauxval.inc"
 #elif defined(_WIN32)

compiler-rt/lib/builtins/cpu_model/aarch64/hwcap.inc

@@ -1,8 +1,3 @@
-#if __has_include(<sys/hwcap.h>)
-#include <sys/hwcap.h>
-#define HAVE_SYS_HWCAP_H
-#endif
-
 #ifndef _IFUNC_ARG_HWCAP
 #define _IFUNC_ARG_HWCAP (1ULL << 62)
 #endif

compiler-rt/lib/builtins/cpu_model/aarch64/lse_atomics/android.inc

@@ -1,5 +1,4 @@
 #include <string.h>
-#include <sys/auxv.h>
 #include <sys/system_properties.h>
 
 static bool __isExynos9810(void) {

compiler-rt/lib/builtins/cpu_model/aarch64/lse_atomics/getauxval.inc

@@ -1,5 +1,3 @@
-#include <sys/auxv.h>
-
 static void CONSTRUCTOR_ATTRIBUTE init_have_lse_atomics(void) {
   unsigned long hwcap = getauxval(AT_HWCAP);
   __aarch64_have_lse_atomics = (hwcap & HWCAP_ATOMICS) != 0;