Add Throw and ReThrow nodes. Rethrow not yet tested (bailout with untested), since it needs the try…

runtime/vm/intermediate_language.cc

Index: runtime/vm/intermediate_language.cc
===================================================================
--- runtime/vm/intermediate_language.cc	(revision 5480)
+++ runtime/vm/intermediate_language.cc	(working copy)
@@ -84,6 +84,7 @@
 // ==== Postorder graph traversal.
 void JoinEntryInstr::Postorder(GrowableArray<BlockEntryInstr*>* block_entries) {
   flip_mark();
+  ASSERT(successor_ != NULL);
   if (successor_->mark() != mark()) successor_->Postorder(block_entries);
   block_entries->Add(this);
 }
@@ -92,6 +93,7 @@
 void TargetEntryInstr::Postorder(
     GrowableArray<BlockEntryInstr*>* block_entries) {
   flip_mark();
+  ASSERT(successor_ != NULL);
   if (successor_->mark() != mark()) successor_->Postorder(block_entries);
   block_entries->Add(this);
 }
@@ -99,24 +101,28 @@
 
 void PickTempInstr::Postorder(GrowableArray<BlockEntryInstr*>* block_entries) {
   flip_mark();
+  ASSERT(successor_ != NULL);
   if (successor_->mark() != mark()) successor_->Postorder(block_entries);
 }
 
 
 void TuckTempInstr::Postorder(GrowableArray<BlockEntryInstr*>* block_entries) {
   flip_mark();
+  ASSERT(successor_ != NULL);
   if (successor_->mark() != mark()) successor_->Postorder(block_entries);
 }
 
 
 void DoInstr::Postorder(GrowableArray<BlockEntryInstr*>* block_entries) {
   flip_mark();
+  ASSERT(successor_ != NULL);
   if (successor_->mark() != mark()) successor_->Postorder(block_entries);
 }
 
 
 void BindInstr::Postorder(GrowableArray<BlockEntryInstr*>* block_entries) {
   flip_mark();
+  ASSERT(successor_ != NULL);
   if (successor_->mark() != mark()) successor_->Postorder(block_entries);
 }