Don't need to specify the abi as it's the default.

rdar://11842763

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160554 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGenObjC/layout-bitfield-crash.m

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -triple x86_64-apple-darwin11 -fobjc-runtime=macosx-10.7 -fobjc-gc -emit-llvm -g -o - %s
+// RUN: %clang_cc1 -triple x86_64-apple-darwin11 -fobjc-gc -emit-llvm -g -o - %s
 // Check that this doesn't crash when compiled with debugging on.
 @class Foo;
 typedef struct Bar *BarRef;