Michael Kuperstein 25e34d11f3 [DAGCombine] Produce better code for constant splats ...

This solves PR22276.
Splats of constants would sometimes produce redundant shuffles, sometimes ridiculously so (see the PR for details). Fold these shuffles into BUILD_VECTORs early on instead.

Differential Revision: http://reviews.llvm.org/D7093

Fixed recommit of r226811.

llvm-svn: 226816

2015-01-22 13:07:28 +00:00

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