[PATCH] [mips] Honour -mno-odd-spreg for vector insert/extract when MSA is enabled.

[Daniel Sanders]

Hi vmedic, sstankovic,

-mno-odd-spreg prohibits the use of odd-numbered single-precision floating
point registers. However, vector insert/extract was still using them when
manipulating the subregisters of an MSA register. Fixed this by ensuring
that insertion/extraction is only performed on even-numbered vector
registers when -mno-odd-spreg is given.

http://reviews.llvm.org/D7672

Files:
  lib/Target/Mips/MipsRegisterInfo.td
  lib/Target/Mips/MipsSEISelLowering.cpp
  test/CodeGen/Mips/no-odd-spreg-msa.ll

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