[llvm] [RISCV] Add compress patterns for Xqcilo load/store instructions (PR #137758)

[Sudharsan Veeravalli via llvm-commits]

svs-quic wrote:

> Nice. Do we need to adjust the emitter to prioritise the patterns with the biggest size savings or is the file ordering good enough?

I looked at the compress patterns and they do no have an equivalent of the AddedComplexity that the ISEL patterns have. The compress patterns in RISCVInstrInfoC.td seem to be following the file ordering.

https://github.com/llvm/llvm-project/pull/137758