[PATCH] [mips] Promote i32 arguments to i64 for the N32/N64 ABI and fix <64-bit structs...

[David Chisnall]

Nothing obviously bad jumps out.  Given that it fixes a load of things that are currently badly broken for us, I'd prefer to see these all go in immediately and have post-commit review if needed.

http://reviews.llvm.org/D6117