[llvm] [PatternMatch] Fix matching order for `m_c_Intrinsic` (PR #166047)

[Ramkumar Ramachandra via llvm-commits]

https://github.com/artagnon commented:

I'm confused what the functional change is here: can you write a test in PatternMatchTest?

https://github.com/llvm/llvm-project/pull/166047