Permit ABIs where the caller extends the result (test change).

This test was written to make sure *something* sane is generated, not
to test any ABI's signedness semantics.

This should allow the test to pass if AArch64 is the default target.

llvm-svn: 174618

clang/test/CodeGenCXX/builtins.cpp

@@ -4,6 +4,6 @@
 extern "C" char memmove();
 
 int main() {
-  // CHECK: call signext i8 @memmove()
+  // CHECK: call {{signext i8|i8}} @memmove()
   return memmove();
 }