[llvm] ConstraintElimination: use DynamicAPInt (PR #99019)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

Compile-time impact: https://llvm-compile-time-tracker.com/compare.php?from=c5ee3c05ca61f3fae11337c5853aee7b450a9dc6&to=dcd0c32ad587fbb884ceb76e043e1c2714f556ca&stat=instructions:u


https://github.com/llvm/llvm-project/pull/99019