Change the PassManager from a reference to a pointer.

The TargetPassManager's default constructor wants to initialize the PassManager
to 'null'. But it's illegal to bind a null reference to a null l-value. Make the
ivar a pointer instead.
PR12468


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155902 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/MSP430/MSP430TargetMachine.cpp b/lib/Target/MSP430/MSP430TargetMachine.cpp
index 9f2eda1..3acf96b 100644
--- a/lib/Target/MSP430/MSP430TargetMachine.cpp
+++ b/lib/Target/MSP430/MSP430TargetMachine.cpp
@@ -60,12 +60,12 @@
 
 bool MSP430PassConfig::addInstSelector() {
   // Install an instruction selector.
-  PM.add(createMSP430ISelDag(getMSP430TargetMachine(), getOptLevel()));
+  PM->add(createMSP430ISelDag(getMSP430TargetMachine(), getOptLevel()));
   return false;
 }
 
 bool MSP430PassConfig::addPreEmitPass() {
   // Must run branch selection immediately preceding the asm printer.
-  PM.add(createMSP430BranchSelectionPass());
+  PM->add(createMSP430BranchSelectionPass());
   return false;
 }