[HWASan] deflake hwasan_symbolize test

[fmayer]

Summary

Also enable on X86_64.

The directory would change during the test execution. This should not
necessarily prevent us from indexing a directory (a user might
potentially do that if they specify a parent directory of the actual
symbols directory, and change unrelated files).

[fmayer]

style

[eugenis]

LGTM

compiler-rt/lib/hwasan/scripts/hwasan_symbolize

for i in range(0, e_shnum):
     if sh_offset is None:
       continue
     note_hdr = mv[sh_offset: sh_offset + sh_size]
     result = handle_Nhdr(note_hdr, sh_size)
     if result is not None:
       return result
 
 def get_buildid(filename):
+  try:
     with open(filename, "r") as fd:
       if os.fstat(fd.fileno()).st_size < Ehdr_size:
         return None
       with mmap.mmap(fd.fileno(), 0, access=mmap.ACCESS_READ) as m:
         with memoryview(m) as mv:
           return handle_elf(mv)
+  except FileNotFoundError:
+    # Ignore if the filesystem changed under us.
+    return None
 
 class Symbolizer:
   def __init__(self, path, binary_prefixes, paths_to_cut):
     self.__pipe = None
     self.__path = path
     self.__binary_prefixes = binary_prefixes
     self.__paths_to_cut = paths_to_cut
     self.__log = False

compiler-rt/test/hwasan/TestCases/hwasan_symbolize.cpp

 // RUN: %clang_hwasan -Wl,--build-id -g %s -o %t
 // RUN: echo '[{"prefix": "'"$(realpath $(dirname %s))"'/", "link": "http://test.invalid/{file}:{line}"}]' > %t.linkify
 // RUN: %env_hwasan_opts=symbolize=0 not %run %t 2>&1 | hwasan_symbolize --html --symbols $(dirname %t) --index | FileCheck %s
 // RUN: %env_hwasan_opts=symbolize=0 not %run %t 2>&1 | hwasan_symbolize --html --linkify %t.linkify --symbols $(dirname %t) --index | FileCheck --check-prefixes=CHECK,LINKIFY %s
 // RUN: %env_hwasan_opts=symbolize=0 not %run %t 2>&1 | hwasan_symbolize --symbols $(dirname %t) --index | FileCheck %s
 
-// There are currently unrelated problems on x86_64, so skipping for now.
-// REQUIRES: android
 // REQUIRES: stable-runtime
 
 #include <sanitizer/hwasan_interface.h>
 #include <stdlib.h>
 
 static volatile char sink;
 
 int main(int argc, char **argv) {