[PATCH] [sanitizer] Use size_t on g_tls_size

[hjl.tools]

Summary

Fix build on x32 where size_t == unsigned int, not unsigned long int:

../../../../../src-master/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cpp: In function ??void sanitizer::InitTlsSize()??:
../../../../../src-master/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cpp:209:55: error: invalid conversion from ??sanitizer::uptr*?? {aka ??long unsigned int*??} to ??size_t*?? {aka ??unsigned int*??} [-fpermissive]

209 |   ((void (*)(size_t *, size_t *))get_tls_static_info)(&g_tls_size, &tls_align);
    |                                                       ^~~~~~~~~~~
    |                                                       |
    |                                                       __sanitizer::uptr* {aka long unsigned int*}

by using size_t on g_tls_size. This is to fix:

https://bugs.llvm.org/show_bug.cgi?id=50332

[MaskRay]

LGTM.

[hjl.tools]

In D102446#2758313, @MaskRay wrote:

LGTM.

Can you push it for me? Thanks.

compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp

 // #19826) so dlpi_tls_data cannot be used.
 //
 // musl before 1.2.3 and FreeBSD as of 12.2 incorrectly set dlpi_tls_data to
 // the TLS initialization image
 // https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254774
 __attribute__((unused)) static int g_use_dlpi_tls_data;
 
 #if SANITIZER_GLIBC && !SANITIZER_GO
-__attribute__((unused)) static uptr g_tls_size;
+__attribute__((unused)) static size_t g_tls_size;
 void InitTlsSize() {
   int major, minor, patch;
   g_use_dlpi_tls_data =
       GetLibcVersion(&major, &minor, &patch) && major == 2 && minor >= 25;
 
 #if defined(__x86_64__) || defined(__powerpc64__)
   void *get_tls_static_info = dlsym(RTLD_NEXT, "_dl_get_tls_static_info");
   size_t tls_align;