More accurate live variables at the control point.

Variables that die immediately after the control point are not live and thus
don't need to be tracked and passed into traces. This reduces the number of
live variables at the control point by one in some tests.

llvm/lib/Transforms/Yk/ControlPoint.cpp

@@ -193,7 +193,8 @@ class YkControlPoint : public ModulePass {
 
       // Get live variables.
       LivenessAnalysis LA(Caller);
-      auto Lives = LA.getLiveVarsBefore(OldCtrlPointCall);
+      auto Lives =
+          LA.getLiveVarsBefore(OldCtrlPointCall->getNextNonDebugInstruction());
 
       Value *SMID = ConstantInt::get(Type::getInt64Ty(Context), CPStackMapID);
       Value *Shadow = ConstantInt::get(Type::getInt32Ty(Context), CPShadow);