Make CodeGenCXX/arm-swiftcall.cpp tolerate C++11

[probinson]

Summary

The test conjures up and returns a temp which has a struct type, and the struct has some empty/padding bytes in the middle. In C++03 these are handled as zero, so the code uses 'llvm.memset' to initialize the temp.
In C++11, the padding is handled as undef, so the code uses 'llvm.memcpy' instead, making the test fail.

I've made the test run twice, once per dialect, and check for the appropriate intrinsic.
It doesn't look like this is the point of the test, though,. so maybe hard-coding the dialect would be preferable.

[rjmccall]

Yes, I think being more specific about the dialect would be better.

[probinson]

Force C++03 on this test, to make it insensitive to future changes in the default dialect.

[rjmccall]

LGTM, thanks!

cfe/trunk/test/CodeGenCXX/arm-swiftcall.cpp

-// RUN: %clang_cc1 -triple armv7-apple-darwin9 -emit-llvm -o - %s -Wno-return-type-c-linkage | FileCheck %s
+// RUN: %clang_cc1 -triple armv7-apple-darwin9 -emit-llvm -o - %s -Wno-return-type-c-linkage -std=c++03 | FileCheck %s -check-prefixes=CHECK
 
 // This isn't really testing anything ARM-specific; it's just a convenient
 // 32-bit platform.
 
 #define SWIFTCALL __attribute__((swiftcall))
 #define OUT __attribute__((swift_indirect_result))
 #define ERROR __attribute__((swift_error_result))
 #define CONTEXT __attribute__((swift_context))