[llvm] [mlir] [LLVM] Refactor intrinsic validation (PR #194061)

[Rahul Joshi via llvm-commits]

jurahul wrote:

Gentle ping @nikic to provide feedback on the direction. In terms of actual PR, in addition to using templating to compile out the error message generation code, the other possibility is to pass a std::string & directly instead of raw_ostream to capture the error message generated.

https://github.com/llvm/llvm-project/pull/194061