Switch to the new MingW ABI.

GCC 4.7 changed the MingW ABI. On the clang side this means that methods now
have the thiscall calling convention by default.

llvm-svn: 197164
diff --git a/clang/test/CodeGenCXX/volatile-1.cpp b/clang/test/CodeGenCXX/volatile-1.cpp
index 71ff1ed..472c01a 100644
--- a/clang/test/CodeGenCXX/volatile-1.cpp
+++ b/clang/test/CodeGenCXX/volatile-1.cpp
@@ -248,11 +248,11 @@
   // gcc.
 
   // Not a use.  gcc forgets to do the assignment.
-  // CHECK-NEXT: call
+  // CHECK-NEXT: call {{.*}}void
   ((a=a),a);
 
   // Not a use.  gcc gets this wrong, it doesn't emit the copy!  
-  // CHECK-NEXT: call
+  // CHECK-NEXT: call {{.*}}void
   (void)(a=a);
 
   // Not a use.  gcc got this wrong in 4.2 and omitted the side effects