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Commit 96f0d383 authored by David Majnemer's avatar David Majnemer
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[SCCP] Resolve shifts beyond the bitwidth to undef 

Shifts beyond the bitwidth are undef but SCCP resolved them to zero.
Instead, DTRT and resolve them to undef.

This reimplements the transform which caused PR27712.

llvm-svn: 269269
parent 83002728
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