[compiler-rt][hwasan] Update register-dump-read.c test

Since d564cfb53c moved
__hwasan_tag_mismatch4 this test has been reporting
a frame 0 of __hwasan_tag_mismatch_v2.

This failure can be seen on our bots:
https://lab.llvm.org/buildbot/#/builders/185/builds/170

Before the change:
 #0 0xaaaaba100e40 in main <...>/register-dump-read.c:21:10
After the change:
 #0 0xaaaab8494bec in __hwasan_tag_mismatch_v2 <...>/hwasan/hwasan_tag_mismatch_aarch64.S:147
 #1 0xaaaab84b4df8 in main <..>/register-dump-read.c:14:10

Update the test to check for a main frame as either frame
0 or frame 1.

compiler-rt/test/hwasan/TestCases/register-dump-read.c

@@ -21,7 +21,8 @@ int main() {
   return x[16];
 
   // CHECK: ERROR: HWAddressSanitizer:
-  // CHECK: #0 {{.*}} in main {{.*}}register-dump-read.c:[[@LINE-3]]
+  // First frame might be __hwasan_tag_mismatch<...> so main could be frame 0 or 1.
+  // CHECK: #{{(0|1) .*}} in main {{.*}}register-dump-read.c:[[@LINE-4]]
 
   // Developer note: FileCheck really doesn't like when you have a regex that
   // ends with a '}' character, e.g. the regex "[0-9]{10}" will fail, because