[llvm] [CodeGen] Remove dead hack for MIPS (PR #148039)

[Craig Topper via llvm-commits]

topperc wrote:

> @arsenm Thoughts?

Are you able to explain why it is no longer needed? The code in MipsSEDAGToDAGISel::processFunctionAfterISel mentioned in http://llvm.org/PR27116 is still present.

https://github.com/llvm/llvm-project/pull/148039