[msan][tsan] Refine __fxstat{,at}{,64} condition

In glibc before 2.33, include/sys/stat.h defines fstat/fstat64 to
`__fxstat/__fxstat64` and provides `__fxstat/__fxstat64` in libc_nonshared.a.
The symbols are glibc specific and not needed on other systems.

Reviewed By: vitalybuka, #sanitizers

Differential Revision: https://reviews.llvm.org/D118423

Author: MaskRay

compiler-rt/lib/msan/msan_interceptors.cpp

@@ -666,7 +666,7 @@ INTERCEPTOR(int, fstat, int fd, void *buf) {
 #define MSAN_MAYBE_INTERCEPT_FSTAT
 #endif
 
-#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
+#if SANITIZER_GLIBC
 INTERCEPTOR(int, __fxstat, int magic, int fd, void *buf) {
   ENSURE_MSAN_INITED();
   int res = REAL(__fxstat)(magic, fd, buf);
@@ -679,7 +679,7 @@ INTERCEPTOR(int, __fxstat, int magic, int fd, void *buf) {
 #define MSAN_MAYBE_INTERCEPT___FXSTAT
 #endif
 
-#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
+#if SANITIZER_GLIBC
 INTERCEPTOR(int, __fxstat64, int magic, int fd, void *buf) {
   ENSURE_MSAN_INITED();
   int res = REAL(__fxstat64)(magic, fd, buf);
@@ -704,7 +704,7 @@ INTERCEPTOR(int, fstatat, int fd, char *pathname, void *buf, int flags) {
 #  define MSAN_MAYBE_INTERCEPT_FSTATAT
 #endif
 
-#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
+#if SANITIZER_GLIBC
 INTERCEPTOR(int, __fxstatat, int magic, int fd, char *pathname, void *buf,
             int flags) {
   ENSURE_MSAN_INITED();
@@ -717,7 +717,7 @@ INTERCEPTOR(int, __fxstatat, int magic, int fd, char *pathname, void *buf,
 #  define MSAN_MAYBE_INTERCEPT___FXSTATAT
 #endif
 
-#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
+#if SANITIZER_GLIBC
 INTERCEPTOR(int, __fxstatat64, int magic, int fd, char *pathname, void *buf,
             int flags) {
   ENSURE_MSAN_INITED();

compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp

@@ -1536,7 +1536,7 @@ TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
   return 0;
 }
 
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
+#if SANITIZER_GLIBC
 TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
   SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
   if (fd > 0)
@@ -1562,7 +1562,7 @@ TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
 #endif
 }
 
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
+#if SANITIZER_GLIBC
 TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
   SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
   if (fd > 0)
@@ -1574,7 +1574,7 @@ TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
 #define TSAN_MAYBE_INTERCEPT___FXSTAT64
 #endif
 
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
+#if SANITIZER_GLIBC
 TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
   SCOPED_TSAN_INTERCEPTOR(__fxstat64, 0, fd, buf);
   if (fd > 0)