add EP_OptimizerLast extension point

llvm-svn: 153353

llvm/include/llvm/Transforms/IPO/PassManagerBuilder.h

@@ -73,6 +73,10 @@ public:
     /// cleanup-ish optimizations.
     EP_ScalarOptimizerLate,
 
+    /// EP_OptimizerLast -- This extension point allows adding passes that
+    /// run after everything else.
+    EP_OptimizerLast,
+
     /// EP_EnabledOnOptLevel0 - This extension point allows adding passes that
     /// should not be disabled by O0 optimization level. The passes will be
     /// inserted after the inlining pass.

llvm/lib/Transforms/IPO/PassManagerBuilder.cpp

@@ -202,6 +202,7 @@ void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
     if (OptLevel > 1)
       MPM.add(createConstantMergePass());     // Merge dup global constants
   }
+  addExtensionsToPM(EP_OptimizerLast, MPM);
 }
 
 void PassManagerBuilder::populateLTOPassManager(PassManagerBase &PM,