VM: New calling convention for generated code.

runtime/vm/flow_graph_compiler.h

Index: runtime/vm/flow_graph_compiler.h
diff --git a/runtime/vm/flow_graph_compiler.h b/runtime/vm/flow_graph_compiler.h
index 17b2612f0f98ec44f182135225141d2af8399ae5..93c33d01c19134c6112a19a790cd4286c110939f 100644
--- a/runtime/vm/flow_graph_compiler.h
+++ b/runtime/vm/flow_graph_compiler.h
@@ -337,13 +337,13 @@ class FlowGraphCompiler : public ValueObject {
                            LocationSummary* locs);
 
   void GenerateCall(intptr_t token_pos,
-                    const ExternalLabel* label,
+                    const Code& label,
                     RawPcDescriptors::Kind kind,
                     LocationSummary* locs);
 
   void GenerateDartCall(intptr_t deopt_id,
                         intptr_t token_pos,
-                        const ExternalLabel* label,
+                        const Code& target,
                         RawPcDescriptors::Kind kind,
                         LocationSummary* locs);
 
@@ -393,14 +393,14 @@ class FlowGraphCompiler : public ValueObject {
   static int32_t EdgeCounterIncrementSizeInBytes();
 #endif  // !TARGET_ARCH_ARM64 && !TARGET_ARCH_MIPS
 
-  void EmitOptimizedInstanceCall(ExternalLabel* target_label,
+  void EmitOptimizedInstanceCall(const Code& target,
                                  const ICData& ic_data,
                                  intptr_t argument_count,
                                  intptr_t deopt_id,
                                  intptr_t token_pos,
                                  LocationSummary* locs);
 
-  void EmitInstanceCall(ExternalLabel* target_label,
+  void EmitInstanceCall(const Code& target,
                         const ICData& ic_data,
                         intptr_t argument_count,
                         intptr_t deopt_id,