Implement StaticCall and InstanceCall in the new code generator.

runtime/vm/flow_graph_compiler_x64.h

Index: runtime/vm/flow_graph_compiler_x64.h
diff --git a/runtime/vm/flow_graph_compiler_x64.h b/runtime/vm/flow_graph_compiler_x64.h
index c62ff3c84f9659c31aae8c95ed242084a98f5524..4bed9f7648cf280eae03c690d722c4b137e30a61 100644
--- a/runtime/vm/flow_graph_compiler_x64.h
+++ b/runtime/vm/flow_graph_compiler_x64.h
@@ -64,6 +64,9 @@ class FlowGraphCompiler : public FlowGraphVisitor {
   void LoadValue(Value* value);
 
   // Infrastructure copied from class CodeGenerator.
+  void GenerateCall(intptr_t token_index,
+                    const ExternalLabel* label,
+                    PcDescriptors::Kind kind);
   void GenerateCallRuntime(intptr_t node_id,
                            intptr_t token_index,
                            const RuntimeEntry& entry);