[llvm] [TableGen] Rework `EmitIntrinsicToBuiltinMap` (PR #104681)

[Artem Belevich via llvm-commits]

Artem-B wrote:

> > Thanks @arsenm. I realized though that change in the `BuiltinEntry` struct is actually a space regression. We have one 
> >  ,,, 
> @Artem-B ^^

I doubt that the space used for builtins info makes any practical difference. If it does not affect or improves performance, I'm fine with it.


https://github.com/llvm/llvm-project/pull/104681