Make some foo.h headers usable without foo-inl.h header.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 16676202cf08b02c1dd65011a4c4e774ab3b7e3d..1cb246b30ac51681ff31c266222f00c66efb1f07 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -153,16 +153,6 @@ bool Object::IsExternal() const {
 bool Object::IsAccessorInfo() const { return IsExecutableAccessorInfo(); }
 
 
-bool Object::IsSmi() const {
-  return HAS_SMI_TAG(this);
-}
-
-
-bool Object::IsHeapObject() const {
-  return Internals::HasHeapObjectTag(this);
-}
-
-
 TYPE_CHECKER(HeapNumber, HEAP_NUMBER_TYPE)
 TYPE_CHECKER(MutableHeapNumber, MUTABLE_HEAP_NUMBER_TYPE)
 TYPE_CHECKER(Symbol, SYMBOL_TYPE)