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Craig Topper
40e2c0da6c
[DAGCombiner] Remove (sra (shl X, C), C) if X has more than C sign bits.
If sext_inreg is supported, we will turn this into sext_inreg. That will then remove it if there are enough sign bits. But if sext_inreg isn't supported, we can still remove the shift pair based on sign bits. Split from D95890.
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