[PATCH] [ScheduleDAG] Fix for PR32723

[Jonas Paulsson via llvm-commits]

Hi,

A fix for https://bugs.llvm.org//show_bug.cgi?id=32723, is to check for 
MVT::Untyped before calling TLI->getRepRegClassFor(), which crashes with 
this type as argument.

To fix the crash found, it was necessary to add this check in two places 
in RegReductionPQBase::RegPressureDiff(), but it seemed right to do it 
in all places
this function is called to avoid similar crashes.

(Follow link for discussion)

/Jonas


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