[clang] [NFC][analyzer] Introduce specialized variants of makeNode (PR #194459)

[Donát Nagy via cfe-commits]

NagyDonat wrote:

I won't involve @tigbr in NodeBuilder reviews right now, because he will have an exam season and before that he'll focus on the `LocationContext` transition; but he's interested in helping this area with reviews in the future.

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I updated the PR description to emphasize that the functions that are introduced here will be used many times. Unless there are objections, I'll merge this commit soon (when I'll start working on a follow-up commit that requires these methods). 

https://github.com/llvm/llvm-project/pull/194459