[llvm] [llvm-reduce] Remove intrinsic-like-functions test (PR #196436)

[Matt Arsenault via llvm-commits]

arsenm wrote:

See isIntrinsic, which is HasLLVMReservedName. This is distinct from getIntrinsicID() != not_intrinsic. This will break cases that are typos, or removed intrinsics 

https://github.com/llvm/llvm-project/pull/196436