Add support for converted closures with explicit contexts to VM

runtime/vm/kernel_binary_flowgraph.h

Index: runtime/vm/kernel_binary_flowgraph.h
diff --git a/runtime/vm/kernel_binary_flowgraph.h b/runtime/vm/kernel_binary_flowgraph.h
index 3e741db6a38e91504abca280eeca4794f12c1e6b..b201113434168d85c1daae0f33b61c4b1da1230e 100644
--- a/runtime/vm/kernel_binary_flowgraph.h
+++ b/runtime/vm/kernel_binary_flowgraph.h
@@ -228,6 +228,7 @@ class StreamingFlowGraphBuilder {
   BreakableBlock* breakable_block();
   GrowableArray<YieldContinuation>& yield_continuations();
   Value* stack();
+  void Push(Definition* definition);
   Value* Pop();
 
   Tag PeekArgumentsFirstPositionalTag();
@@ -280,8 +281,13 @@ class StreamingFlowGraphBuilder {
       const TypeArguments& type_arguments);
   Fragment StrictCompare(Token::Kind kind, bool number_check = false);
   Fragment AllocateObject(const dart::Class& klass, intptr_t argument_count);
+  Fragment AllocateObject(const dart::Class& klass,
+                          const Function& closure_function);
+  Fragment LoadField(intptr_t offset);
+  Fragment AllocateContext(int size);
   Fragment StoreLocal(TokenPosition position, LocalVariable* variable);
   Fragment StoreStaticField(TokenPosition position, const dart::Field& field);
+  Fragment StoreInstanceField(TokenPosition position, intptr_t offset);
   Fragment StringInterpolate(TokenPosition position);
   Fragment StringInterpolateSingle(TokenPosition position);
   Fragment ThrowTypeError();
@@ -368,6 +374,11 @@ class StreamingFlowGraphBuilder {
   Fragment BuildDoubleLiteral(TokenPosition* position);
   Fragment BuildBoolLiteral(bool value, TokenPosition* position);
   Fragment BuildNullLiteral(TokenPosition* position);
+  Fragment BuildVectorCreation(TokenPosition* position);
+  Fragment BuildVectorGet(TokenPosition* position);
+  Fragment BuildVectorSet(TokenPosition* position);
+  Fragment BuildVectorCopy(TokenPosition* position);
+  Fragment BuildClosureCreation(TokenPosition* position);
 
   Fragment BuildInvalidStatement();
   Fragment BuildExpressionStatement();