[llvm] [RISCV] Add compress patterns for Xqcibi branch instructions (PR #143095)

[Sam Elliott via llvm-commits]

https://github.com/lenary commented:

Please can you add some more tests for the long branch relaxation done in the assembler?

The comment changes are nits, a typo and trying to be specific about which patterns we mean, because there are two kinds of patterns interacting oddly here.

https://github.com/llvm/llvm-project/pull/143095