CellSPU:
- Fix fabs, fneg for f32 and f64.
- Use BuildVectorSDNode.isConstantSplat, now that the functionality exists
- Continue to improve i64 constant lowering. Lower certain special constants
to the constant pool when they correspond to SPU's shufb instruction's
special mask values. This avoids the overhead of performing a shuffle on a
zero-filled vector just to get the special constant when the memory load
suffices.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67067
91177308-0d34-0410-b5e6-
96231b3b80d8
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