Move the adc-builtins test to the pattern of the other builtins

tests by predefining _MM_MALLOC_H rather than use -ffreestanding.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@250203 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/adc-builtins.c

-// RUN: %clang_cc1 -triple x86_64-unknown-unknown -ffreestanding -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s | FileCheck %s
+
+#define __MM_MALLOC_H
 
 #include <x86intrin.h>