fix param in codegenpassbuilder

Author: optimisan

llvm/include/llvm/Passes/CodeGenPassBuilder.h

@@ -1222,7 +1222,7 @@ void CodeGenPassBuilder<Derived, TargetMachineT>::addMachineLateOptimization(
 template <typename Derived, typename TargetMachineT>
 void CodeGenPassBuilder<Derived, TargetMachineT>::addBlockPlacement(
     AddMachinePass &addPass) const {
-  addPass(MachineBlockPlacementPass());
+  addPass(MachineBlockPlacementPass(Opt.EnableTailMerge));
   // Run a separate pass to collect block placement statistics.
   if (Opt.EnableBlockPlacementStats)
     addPass(MachineBlockPlacementStatsPass());

llvm/include/llvm/Target/CGPassBuilderOption.h

@@ -50,6 +50,7 @@ struct CGPassBuilderOption {
   bool EnableGlobalMergeFunc = false;
   bool EnableMachineFunctionSplitter = false;
   bool EnableSinkAndFold = false;
+  bool EnableTailMerge = true;
   bool MISchedPostRA = false;
   bool EarlyLiveIntervals = false;
   bool GCEmptyBlocks = false;