[PATCH] [DAGCombiner] Add support for FCEIL, FFLOOR and FTRUNC vector constant folding

[Simon Pilgrim]

Hi qcolombet, mkuper, andreadb,

This patch adds supports for the vector constant folding of FCEIL, FFLOOR and FTRUNC instructions. We can't safely use the scalar versions of these folds as they may not all correctly fold so the folding is done locally.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8715

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  test/CodeGen/X86/vec_floor.ll

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