hwasan_symbolize: allow 0x in the address field

[eugenis]

Summary

Fix parsing of mangled stack trace lines where the address has been
replaced with "0x", literally.

[merge_guards_bot]

Unit tests: pass. 62378 tests passed, 0 failed and 839 were skipped.

clang-tidy: pass.

clang-format: pass.

Build artifacts: diff.json, clang-tidy.txt, clang-format.patch, CMakeCache.txt, console-log.txt, test-results.xml

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compiler-rt/lib/hwasan/scripts/hwasan_symbolize

try:
         file_line = self.__read()
         file_line = self.__process_source_path(file_line)
         yield (function_name, file_line)
     except Symbolizer.__EOF:
       pass
 
 def symbolize_line(line, symbolizer_path):
   #0 0x7f6e35cf2e45  (/blah/foo.so+0x11fe45)
-  match = re.match(r'^(.*?)#([0-9]+)( *)(0x[0-9a-f]+) *\((.*)\+(0x[0-9a-f]+)\)', line, re.UNICODE)
+  match = re.match(r'^(.*?)#([0-9]+)( *)(0x[0-9a-f]*) *\((.*)\+(0x[0-9a-f]+)\)', line, re.UNICODE)
   if match:
     frameno = match.group(2)
     binary = match.group(5)
     addr = int(match.group(6), 16)
 
     frames = list(symbolizer.iter_call_stack(binary, addr))
 
     if len(frames) > 0:
       print "%s#%s%s%s in %s" % (match.group(1).encode('utf-8'), match.group(2).encode('utf-8'),
                                  match.group(3).encode('utf-8'), frames[0][0], frames[0][1])
       for i in range(1, len(frames)):
         space1 = ' ' * match.end(1)
         space2 = ' ' * (match.start(4) - match.end(1) - 2)
         print "%s->%s%s in %s" % (space1, space2, frames[i][0], frames[i][1])
     else:
       print line.rstrip().encode('utf-8')
   else:
     print line.rstrip().encode('utf-8')
 
 def save_access_address(line):
   global last_access_address, last_access_tag
   match = re.match(r'^(.*?)HWAddressSanitizer: tag-mismatch on address (0x[0-9a-f]+) ', line, re.UNICODE)
   if match:
     last_access_address = int(match.group(2), 16)
-  match = re.match(r'^(.*?) of size [0-9]+ at 0x[0-9a-f]+ tags: ([0-9a-f]+)/[0-9a-f]+ \(ptr/mem\)', line, re.UNICODE)
+  match = re.match(r'^(.*?) of size [0-9]+ at 0x[0-9a-f]* tags: ([0-9a-f]+)/[0-9a-f]+ \(ptr/mem\)', line, re.UNICODE)
   if match:
     last_access_tag = int(match.group(2), 16)
 
 def process_stack_history(line, symbolizer, ignore_tags=False):
   if last_access_address is None or last_access_tag is None:
     return
   if re.match(r'Previously allocated frames:', line, re.UNICODE):
     return True