[llvm] [RISCV] Add isel optimization for (and (sra y, c2), c1) to recover regression from #101751. (PR #104114)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

Reproduced with `bin/clang++ -O3 -std=c++20 --target=riscv64-linux-android35 -c test.cpp`. I will provide a smaller reproducer.


https://github.com/llvm/llvm-project/pull/104114