asan: fix a windows test

[dvyukov]

Summary

Before commit "sanitizer_common: introduce kInvalidTid/kMainTid"
asan invalid/unknown thread id was 0xffffff, so presumably we printed "T16777215".
Now it's -1, so we print T-1. Fix the test.
I think the new format is even better, "T-1" clearly looks like something special
rather than a random large number.

compiler-rt/test/asan/TestCases/Windows/queue_user_work_item_report.cpp

 // RUN: %clang_cl_asan -Od %s -Fe%t
 // RUN: not %run %t 2>&1 | FileCheck %s
 
 #include <windows.h>
 
 HANDLE done;
 
 DWORD CALLBACK work_item(LPVOID) {
   int subscript = -1;
   volatile char stack_buffer[42];
   stack_buffer[subscript] = 42;
   // CHECK: AddressSanitizer: stack-buffer-underflow on address [[ADDR:0x[0-9a-f]+]]
-  // CHECK: WRITE of size 1 at [[ADDR]] thread T{{[0-9]+}}
+  // CHECK: WRITE of size 1 at [[ADDR]] thread T-1
   // CHECK:   {{#0 .* work_item.*queue_user_work_item_report.cpp}}:[[@LINE-3]]
   SetEvent(done);
   return 0;
 }
 
 int main(int argc, char **argv) {
   done = CreateEvent(0, false, false, "job is done");
   if (!done)
     return 1;
-// CHECK-NOT: Thread T1 created
+  // CHECK-NOT: Thread {{.*}} created
   QueueUserWorkItem(&work_item, nullptr, 0);
   if (WAIT_OBJECT_0 != WaitForSingleObject(done, 10 * 1000))
     return 2;
 }