Revert "[UpdateTestChecks] Match define for labels"

This reverts commit a888825aeef8d6592c6cf5f4e5854cc39af49633.

This changes the default output of UTC, and as such introduces
spurious changes whenever existing tests are regenerated.

I've indicated in https://reviews.llvm.org/D139006#3989954 how
this can be implemented without causing test churn.
diff --git a/clang/test/utils/update_cc_test_checks/check-globals.test b/clang/test/utils/update_cc_test_checks/check-globals.test
index 494a584..9a2e0cc 100644
--- a/clang/test/utils/update_cc_test_checks/check-globals.test
+++ b/clang/test/utils/update_cc_test_checks/check-globals.test
@@ -56,7 +56,7 @@
  BOTH-NEXT:// CHECK: @bar.i = internal global i32 0, align 4
  BOTH-NEXT:// CHECK: @bar.j = internal global i32 0, align 4
  BOTH-NEXT://.
- BOTH-NEXT:// CHECK-LABEL: define {{.+}}@foo(
+ BOTH-NEXT:// CHECK-LABEL: @foo(
  BOTH-NEXT:// CHECK-NEXT:  entry:
  BOTH-NEXT:// CHECK-NEXT:    ret void
  BOTH-NEXT://
@@ -64,7 +64,7 @@
   NRM-NEXT:  static int i, j;
   NRM-NEXT:}
   IGF-NEXT://
- BOTH-NEXT:// CHECK-LABEL: define {{.+}}@bar(
+ BOTH-NEXT:// CHECK-LABEL: @bar(
  BOTH-NEXT:// CHECK-NEXT:  entry:
  BOTH-NEXT:// CHECK-NEXT:    ret void
  BOTH-NEXT://