Florian Hahn a8e9742bd4 [IndVarSimplify] Clear block and loop dispositions after moving instr. ...

Moving an instruction can invalidate the cached block dispositions of
the corresponding SCEV. Invalidate the cached dispositions.

Also fixes a copy-paste error in forgetBlockAndLoopDispositions where
the start expression S was removed from BlockDispositions in the loop
but not the current values. This was also exposed by the new test case.

Fixes #58439.

2022-10-18 16:18:14 +01:00

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