[NFCI][analyzer] Spread use of CoreEngine::makeNode (#183540) Simplify the code of `CoreEngine` by using the method `CoreEngine::makeNode` (which was introduced recently in commit 1a81673922a3f5b75f342e416e925a69822c4613) and removing two similar, but less practical utility methods. This is technically speaking not an NFC change, because previously these were able to generate non-sink nodes with `PosteriorlyOverconstrained` state (which is logically unsound) and now the check in `makeNode` prevents that. However I labelled this as an NFCI change, as I'm fairly confident that this won't lead to any observable changes because: - `PosteriorlyOverconstrained` states are very rare. - A state derived from a `PosteriorlyOverconstrained` state is also posteriorly overconstrained, so even without this commit `PosteriorlyOverconstrained` paths would been sunk soon at the next transition that properly checks for it. Note that simulated paths with a `PosteriorlyOverconstrained` state do not correspond to real paths that can occur during the actual execution of the program, so the analyzer should stop following them as soon as possible. For more explanation see the doc-comment above the data member `bool PosteriorlyOverconstrained` within `ProgramState`.
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