[llvm][Support] Fix backtrace match pattern to be consistent with the one generated. NFC

Author: darkbuck

llvm/unittests/Support/SignalsTest.cpp

@@ -46,10 +46,10 @@ TEST(SignalsTest, PrintsSymbolizerMarkup) {
   EXPECT_THAT(
       Res,
       MatchesRegex(".*" TAG_BEGIN
-                   "mmap:0x[0-9a-f]+:0x[0-9a-f]+:load:0:rx:0x[0-9a-f]+" TAG_END
+                   "mmap:0x[0-9a-f]+:0x[0-9a-f]+:load:0:rx:[0-9a-f]+" TAG_END
                    ".*"));
   // Backtrace line
-  EXPECT_THAT(Res, MatchesRegex(".*" TAG_BEGIN "bt:0:0x[0-9a-f]+"
+  EXPECT_THAT(Res, MatchesRegex(".*" TAG_BEGIN "bt:0:[0-9a-f]+"
                                 ".*"));
 }