[Analyzer][Core] Simplify IntSym in SValBuilder

Make the SimpleSValBuilder capable to simplify existing IntSym
expressions based on a newly added constraint on the sub-expression.

Differential Revision: https://reviews.llvm.org/D113754

GitOrigin-RevId: ffc32efd1cd6a34659e2c559e9ba6ee923b1637a
2 files changed