Optimize redundant sign extends and negation of predicates.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150606 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Hexagon/HexagonTargetMachine.cpp b/lib/Target/Hexagon/HexagonTargetMachine.cpp
index 1f7bdf0..6c41885 100644
--- a/lib/Target/Hexagon/HexagonTargetMachine.cpp
+++ b/lib/Target/Hexagon/HexagonTargetMachine.cpp
@@ -101,6 +101,7 @@
 bool HexagonPassConfig::addInstSelector() {
   PM.add(createHexagonRemoveExtendOps(getHexagonTargetMachine()));
   PM.add(createHexagonISelDag(getHexagonTargetMachine()));
+  PM.add(createHexagonPeephole());
   return false;
 }