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[analyzer][StdLibraryFunctionsChecker] Have proper weak dependencies

Authored by martong on Sep 7 2020, 8:15 AM.

Description

[analyzer][StdLibraryFunctionsChecker] Have proper weak dependencies

We want the generice StdLibraryFunctionsChecker to report only if there
are no specific checkers that would handle the argument constraint for a
function.

Note, the assumptions are still evaluated, even if the arguement
constraint checker is set to not report. This means that the assumptions
made in the generic StdLibraryFunctionsChecker should be an
over-approximation of the assumptions made in the specific checkers. But
most importantly, the assumptions should not contradict.

Differential Revision: https://reviews.llvm.org/D87240