Tail call from TurboFan into select runtime calls

src/runtime/runtime.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/runtime/runtime.h"
 #include "src/runtime/runtime-utils.h"
 
 namespace v8 {
@@ skipping 72 matching lines @@
   }
   return NULL;
 }
 
 
 const Runtime::Function* Runtime::FunctionForId(Runtime::FunctionId id) {
   return &(kIntrinsicFunctions[static_cast<int>(id)]);
 }
 
 
+bool Runtime::SupportsTailCall(FunctionId id) {
+  switch (id) {
+#define RUNTIME_FUNCTION_SWITCH(name, a, b) case k##name:
+    FOR_EACH_INTRINSIC_IC(RUNTIME_FUNCTION_SWITCH)
+#undef RUNTIME_FUNCTION_SWITCH
+    return true;
+    default:
+      return false;
+  }
+}
+
+
 std::ostream& operator<<(std::ostream& os, Runtime::FunctionId id) {
   return os << Runtime::FunctionForId(id)->name;
 }
 
 }  // namespace internal
 }  // namespace v8