[Hexagon] Implement commoning of GetElementPtr instructions

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241714 91177308-0d34-0410-b5e6-96231b3b80d8

Author: Krzysztof Parzyszek

lib/Target/Hexagon/CMakeLists.txt

@@ -16,6 +16,7 @@ add_llvm_target(HexagonCodeGen
   HexagonAsmPrinter.cpp
   HexagonBitTracker.cpp
   HexagonCFGOptimizer.cpp
+  HexagonCommonGEP.cpp
   HexagonCopyToCombine.cpp
   HexagonExpandCondsets.cpp
   HexagonExpandPredSpillCode.cpp