fix some differences between apple gcc and clang on darwin/x86-32.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63846 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/CheckBuiltinMacros.sh b/utils/CheckBuiltinMacros.sh
index 6a8573c..1c0b88a 100755
--- a/utils/CheckBuiltinMacros.sh
+++ b/utils/CheckBuiltinMacros.sh
@@ -2,7 +2,7 @@
 set -ex
 
 if [ -z "$CC" ]; then
-    CC="gcc"
+    CC="/Developer/usr/bin/gcc-4.2"
 fi
 
 SRCLANG=c