[llvm] [RISCV] Remove incorrect and untested FrameIndex support from SelectAddrRegImm9. (PR #148779)

[via llvm-commits]

ukalappa-mips wrote:

>>To fold a FrameIndex, we need to teach eliminateFrameIndex to respect the uimm9 range.
@topperc  ,will look into it and raise a new PR to handle uimm9 range 

https://github.com/llvm/llvm-project/pull/148779