[llvm] [LLVM] Fix bug in lookupLLVMIntrinsicByName() with StringRefs th… (PR #145629)

[Rahul Joshi via llvm-commits]

jurahul wrote:

Thanks for the fix, the change looks good. Can you adjust the PR title to be concise, so it does not wrap around into the description? And add a unit test (in llvm/unittests/IR/IntrinsicsTests.cpp)? 

https://github.com/llvm/llvm-project/pull/145629