Robustify test, there is no need to check metadata number which can change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@137752 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/debug-info-member.c

@@ -1,3 +1,3 @@
-// RUN: %clang_cc1 -emit-llvm -g < %s | grep DW_TAG_member | grep \!3
+// RUN: %clang_cc1 -emit-llvm -g < %s | grep DW_TAG_member 
 
 struct A { int x; } a;