livePhysRegs: Pass MBB by reference in addLive{Ins|Outs}(); NFC

The block must no be nullptr for the addLiveIns()/addLiveOuts()
function.

llvm-svn: 268340
diff --git a/llvm/lib/CodeGen/StackMapLivenessAnalysis.cpp b/llvm/lib/CodeGen/StackMapLivenessAnalysis.cpp
index 0d09c23..87e4eb6 100644
--- a/llvm/lib/CodeGen/StackMapLivenessAnalysis.cpp
+++ b/llvm/lib/CodeGen/StackMapLivenessAnalysis.cpp
@@ -128,7 +128,7 @@
     DEBUG(dbgs() << "****** BB " << MBB.getName() << " ******\n");
     LiveRegs.init(TRI);
     // FIXME: This should probably be addLiveOuts().
-    LiveRegs.addLiveOutsNoPristines(&MBB);
+    LiveRegs.addLiveOutsNoPristines(MBB);
     bool HasStackMap = false;
     // Reverse iterate over all instructions and add the current live register
     // set to an instruction if we encounter a patchpoint instruction.