[mips] Simplify LowerFormalArguments using getRegClassFor.

No functionality change.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193540 91177308-0d34-0410-b5e6-96231b3b80d8
Remove 2.4 from the list of supported Python versions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193541 91177308-0d34-0410-b5e6-96231b3b80d8