[stubs] Introduce ToNameStub to implement %_ToName.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 484ebab4a66361facb92b6a65c9358e2cd9e4247..ae0c1e9172f99e7ca259e2102196ed5d12d0fa5f 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -54,6 +54,7 @@ namespace internal {
   V(ToNumber)                               \
   V(ToLength)                               \
   V(ToString)                               \
+  V(ToName)                                 \
   V(ToObject)                               \
   V(VectorStoreICTrampoline)                \
   V(VectorKeyedStoreICTrampoline)           \
@@ -2950,6 +2951,15 @@ class ToStringStub final : public PlatformCodeStub {
 };
 
 
+class ToNameStub final : public PlatformCodeStub {
+ public:
+  explicit ToNameStub(Isolate* isolate) : PlatformCodeStub(isolate) {}
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(ToName);
+  DEFINE_PLATFORM_CODE_STUB(ToName, PlatformCodeStub);
+};
+
+
 class ToObjectStub final : public HydrogenCodeStub {
  public:
   explicit ToObjectStub(Isolate* isolate) : HydrogenCodeStub(isolate) {}