Make this darwin only to simplify the padding calculations per arch.

llvm-svn: 136185
diff --git a/clang/test/CodeGen/2008-08-07-AlignPadding1.c b/clang/test/CodeGen/2008-08-07-AlignPadding1.c
index 5beae3e..2bb2e61 100644
--- a/clang/test/CodeGen/2008-08-07-AlignPadding1.c
+++ b/clang/test/CodeGen/2008-08-07-AlignPadding1.c
@@ -1,4 +1,4 @@
-/* RUN: %clang_cc1 %s -emit-llvm -o - | FileCheck %s
+/* RUN: %clang_cc1 %s -emit-llvm -triple x86_64-apple-darwin -o - | FileCheck %s
 
 The FE must generate padding here both at the end of each PyG_Head and
 between array elements.  Reduced from Python. */