Merging r318207:

Merging r318207:

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r318207 | sdardis | 2017-11-14 22:26:42 +0000 (Tue, 14 Nov 2017) | 18 lines

Reland "[mips][mt][6/7] Add support for mftr, mttr instructions."

This adjusts the tests to hopfully pacify the
llvm-clang-x86_64-expensive-checks-win buildbot.

Unlike many other instructions, these instructions have aliases which
take coprocessor registers, gpr register, accumulator (and dsp accumulator)
registers, floating point registers, floating point control registers and
coprocessor 2 data and control operands.

For the moment, these aliases are treated as pseudo instructions which are
expanded into the underlying instruction. As a result, disassembling these
instructions shows the underlying instruction and not the alias.

Reviewers: slthakur, atanasyan

Differential Revision: https://reviews.llvm.org/D35253

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_50@318386 91177308-0d34-0410-b5e6-96231b3b80d8