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[ValueTracking] computeKnownBitsFromShiftOperator - always return with Known2…

Authored by RKSimon on Nov 10 2020, 8:53 AM.

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[ValueTracking] computeKnownBitsFromShiftOperator - always return with Known2 containing the shifted value source. NFCI.

As detailed on D90479, in most circumstances we will always call computeKnownBits for Op0, so always perform this by pulling out the duplicate calls.

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Committed
RKSimonNov 10 2020, 9:03 AM
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rG929a127932b4: [ValueTracking] computeKnownBitsFromShiftOperator - consistently use Known2 for…
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