[mips] Don't use odd-numbered single precision registers for fastcc calling
convention if -mno-odd-spreg is used.

Differential Revision: http://reviews.llvm.org/D4682


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214180 91177308-0d34-0410-b5e6-96231b3b80d8