[mips][msa] Added support for matching fadd, fdiv, flog2, fmul, frint, fsqrt, and fsub from normal IR (i.e. not intrinsics)



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190512 91177308-0d34-0410-b5e6-96231b3b80d8