[MIPS GlobalISel] Lower float and double arguments in registers

Lower float and double arguments in registers for MIPS32.
When float/double argument is passed through gpr registers
select appropriate move instruction.

Differential Revision: https://reviews.llvm.org/D59642


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356882 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed