[stubs] Unify (and optimize) implementation of ToObject.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 372b788fee1a2d9b9f2c4fb6748a7d7600e218b7..f1759ee3601058c46acd9112c8dcc25efb8b67e7 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -54,6 +54,7 @@ namespace internal {
   V(StubFailureTrampoline)                  \
   V(SubString)                              \
   V(ToNumber)                               \
+  V(ToObject)                               \
   V(VectorStoreICTrampoline)                \
   V(VectorKeyedStoreICTrampoline)           \
   V(VectorStoreIC)                          \
@@ -3050,6 +3051,15 @@ class ToNumberStub final : public PlatformCodeStub {
 };
 
 
+class ToObjectStub final : public HydrogenCodeStub {
+ public:
+  explicit ToObjectStub(Isolate* isolate) : HydrogenCodeStub(isolate) {}
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(ToObject);
+  DEFINE_HYDROGEN_CODE_STUB(ToObject, HydrogenCodeStub);
+};
+
+
 class StringCompareStub : public PlatformCodeStub {
  public:
   explicit StringCompareStub(Isolate* isolate) : PlatformCodeStub(isolate) {}