Reapply "Shuffle around deopt id allocation...

runtime/vm/kernel_to_il.h

Index: runtime/vm/kernel_to_il.h
diff --git a/runtime/vm/kernel_to_il.h b/runtime/vm/kernel_to_il.h
index ae0db180c64fcf424319616ce136a4bf86aee3d3..cc3f0069abbbac382eb681a24ee54029391fca9b 100644
--- a/runtime/vm/kernel_to_il.h
+++ b/runtime/vm/kernel_to_il.h
@@ -1042,6 +1042,7 @@ class FlowGraphBuilder : public ExpressionVisitor, public StatementVisitor {
   void InlineBailout(const char* reason);
 
   TranslationHelper translation_helper_;
+  Thread* thread_;
   Zone* zone_;
 
   // The node we are currently compiling (e.g. FunctionNode, Constructor,
@@ -1056,6 +1057,11 @@ class FlowGraphBuilder : public ExpressionVisitor, public StatementVisitor {
   intptr_t next_block_id_;
   intptr_t AllocateBlockId() { return next_block_id_++; }
 
+  intptr_t GetNextDeoptId() {
+    // TODO(rmacnak): Record current scope / context level.
+    return thread_->GetNextDeoptId();
+  }
+
   intptr_t next_function_id_;
   intptr_t AllocateFunctionId() { return next_function_id_++; }