[clang] [NFC][analyzer] Simplify ExprEngine::Visit, eliminate NodeBuilders (PR #200837)

[Donát Nagy via cfe-commits]

NagyDonat wrote:

I can confirm that this doesn't introduce crashes or influence the set of results on our set of open source projects (memcached, tmux, curl, twin, vim, openssl, sqlite, ffmpeg, postgres, tinyxml2, libwebm, xerces, bitcoin, protobuf, qtbase, contour, openrct2).

https://github.com/llvm/llvm-project/pull/200837