Merging r277426:

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r277426 | nitesh.jain | 2016-08-02 00:18:07 -0700 (Tue, 02 Aug 2016) | 7 lines

[LLVM][MIPS] Add (D)SUBU, (D)ADDU, LUI instructions emulation . Fix emulation for (D)ADDIU, SD/SW and LW/LD instructions

Reviewers: clayborg, jaydeep, bhushan

Subscribers: mohit.bhakkad, slthakur, sdardis, lldb-commits

Differential Revision: https://reviews.llvm.org/D20357
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llvm-svn: 278047