Implement MipsABIInfo::EmitVAArg. This fix enables clang to complete compilation
without bailing out when va_arg is an aggregate expression. However, 
alignment checking needs to be added in isSafeToEliminateVarargsCast in
InstCombineCalls.cpp in order to produce correct mips code (see link below).

http://lists.cs.uiuc.edu/pipermail/llvmdev/2011-July/042047.html





git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@136647 91177308-0d34-0410-b5e6-96231b3b80d8
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