[stubs] Port ToName stub to TurboFan.

src/builtins/builtins-conversion.cc

Index: src/builtins/builtins-conversion.cc
diff --git a/src/builtins/builtins-conversion.cc b/src/builtins/builtins-conversion.cc
index 0d04a02e241132e87aaea3ffb17add337002e901..ff7c8c6c88ed1bf5a12035de3748001f4abe1831 100644
--- a/src/builtins/builtins-conversion.cc
+++ b/src/builtins/builtins-conversion.cc
@@ -141,6 +141,16 @@ void Builtins::Generate_StringToNumber(CodeStubAssembler* assembler) {
   }
 }
 
+void Builtins::Generate_ToName(CodeStubAssembler* assembler) {
+  typedef compiler::Node Node;
+  typedef TypeConversionDescriptor Descriptor;
+
+  Node* input = assembler->Parameter(Descriptor::kArgument);
+  Node* context = assembler->Parameter(Descriptor::kContext);
+
+  assembler->Return(assembler->ToName(context, input));
+}
+
 // ES6 section 7.1.3 ToNumber ( argument )
 void Builtins::Generate_NonNumberToNumber(CodeStubAssembler* assembler) {
   typedef CodeStubAssembler::Label Label;