Fix typo in test.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@51308 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/builtin-stackaddress.c b/test/Sema/builtin-stackaddress.c
index a828168..c030ab3 100644
--- a/test/Sema/builtin-stackaddress.c
+++ b/test/Sema/builtin-stackaddress.c
@@ -7,10 +7,10 @@
 return __builtin_return_address(x); // expected-error{{the level argument for a stack address builtin must be constant}}
 }
 
-void* a(unsigned x) {
+void* c(unsigned x) {
 return __builtin_frame_address(0);
 }
 
-void b(unsigned x) {
+void d(unsigned x) {
 return __builtin_frame_address(x); // expected-error{{the level argument for a stack address builtin must be constant}}
 }