Erik Eckstein 4d1df28de0 ConstantFolding: add constant folding for some floating point intrinsics ...

* `sitofp` signed integer to floating point
* `rint` round floating point to integral
* `bitcast` between integer and floating point

Constant folding `bitcast`s also made it necessary to rewrite constant folding for Nan and inf values, because the old code explicitly checked for `bitcast` intrinsics.
Relying on constant folded `bitcast`s makes the new version much simpler.

It is important to constant fold these intrinsics already in SIL because it enables other optimizations.

2025-04-01 18:13:01 +02:00

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