[PATCH] [mips] Handle transparent unions correctly.

[Simon Atanasyan]

LGTM (with a nit).


================
Comment at: lib/CodeGen/TargetInfo.cpp:5706
@@ -5705,1 +5705,3 @@
 
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+
----------------
I would move this call to the first line of the `MipsABIInfo::classifyArgumentType` function to be sure that all subsequent actions deal with updated `Ty`.

http://reviews.llvm.org/D6963

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