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Summary

  1. [PowerPC] Legalize saturating vector add/sub (details)
Commit 9c64f04df8ecbcad2c527c33f5ef8a7993842001 by nemanja.i.ibm
[PowerPC] Legalize saturating vector add/sub
These intrinsics and the corresponding ISD nodes were recently added.
PPC has instructions that do this for vectors. Legalize them and add
patterns to emit the satuarting instructions.
Differential revision: https://reviews.llvm.org/D71940
The file was modifiedllvm/lib/Target/PowerPC/PPCInstrAltivec.td
The file was modifiedllvm/lib/Target/PowerPC/PPCISelLowering.cpp
The file was addedllvm/test/CodeGen/PowerPC/saturating-intrinsics.ll