Sanjay Patel 523cd8290a [DAG] use isConstOrConstSplat in ComputeNumSignBits to optimize SRA ...

The scalar version of this pattern was noted in:
https://reviews.llvm.org/D25485

and fixed with:
https://reviews.llvm.org/rL284395

More refactoring of the constant/splat helpers is needed and will happen in follow-up patches.

Differential Revision: https://reviews.llvm.org/D25685

llvm-svn: 284424

2016-10-17 20:41:39 +00:00

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