Force arch for these test cases.

llvm-svn: 65252
diff --git a/clang/test/CodeGen/const-init.c b/clang/test/CodeGen/const-init.c
index 128bbb5..a709cef 100644
--- a/clang/test/CodeGen/const-init.c
+++ b/clang/test/CodeGen/const-init.c
@@ -1,4 +1,4 @@
-// RUN: clang -verify -emit-llvm -o %t %s &&
+// RUN: clang -arch i386 -verify -emit-llvm -o %t %s &&
 
 #include <stdint.h>