Merging r243984:

Merging r243984:
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r243984 | vkalintiris | 2015-08-04 07:26:35 -0700 (Tue, 04 Aug 2015) | 11 lines

Revert r229675 - [mips] Avoid redundant sign extension of the result of binary bitwise instructions.

It introduced two regressions on 64-bit big-endian targets running under N32
(MultiSource/Benchmarks/tramp3d-v4/tramp3d-v4, and
MultiSource/Applications/kimwitu++/kc) The issue is that on 64-bit targets
comparisons such as BEQ compare the whole GPR64 but incorrectly tell the
instruction selector that they operate on GPR32's. This leads to the
elimination of i32->i64 extensions that are actually required by
comparisons to work correctly.

There's currently a patch under review that fixes this problem.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_37@244096 91177308-0d34-0410-b5e6-96231b3b80d8