Some initial version of global merger

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100641 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMTargetMachine.cpp b/lib/Target/ARM/ARMTargetMachine.cpp
index 95f57b7..ab299b1 100644
--- a/lib/Target/ARM/ARMTargetMachine.cpp
+++ b/lib/Target/ARM/ARMTargetMachine.cpp
@@ -79,9 +79,15 @@
     TLInfo(*this) {
 }
 
-
-
 // Pass Pipeline Configuration
+bool ARMBaseTargetMachine::addPreISel(PassManagerBase &PM,
+                                      CodeGenOpt::Level OptLevel) {
+  if (OptLevel != CodeGenOpt::None)
+    PM.add(createARMGlobalMergePass(getTargetLowering()));
+
+  return false;
+}
+
 bool ARMBaseTargetMachine::addInstSelector(PassManagerBase &PM,
                                            CodeGenOpt::Level OptLevel) {
   PM.add(createARMISelDag(*this, OptLevel));