[llvm] [RISCV] Add ISel patterns for Qualcomm uC Xqcics extension (PR #146675)

[via llvm-commits]

hchandel wrote:

> Can you add a RUN line with both Xqcicm and Xqcics to show that we prefer Xqcics?

Thanks @svs-quic. Added the RUN line in xqcics.ll. The output produced with both the extensions enabled is same as Xqcics alone, so reused those CHECK prefixes for this RUN line. 

https://github.com/llvm/llvm-project/pull/146675