[Interpreter] Add IsInterpreted() to JSFunction and use to fix test-heap tests.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 9e3c0372ce2e34c091dcda0510015f217c09b823..e1a590b85c5483bfd5912c84dcda061c99e75c9b 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -7378,6 +7378,8 @@ class SharedFunctionInfo: public HeapObject {
   // a Code object or a BytecodeArray.
   inline AbstractCode* abstract_code();
 
+  inline bool IsInterpreted() const;

[Michael Starzinger, 2016/11/09 12:07:23]

nit: Please add a similar comment (like in JSFunction) here. Maybe it might make
sense to briefly mention that the result of this predicate can diverge from the
one in JSFunction and self-healing in the interpreter entry-stub will "heal"
such diverging results (not sure how to best phrase this).

The point I am trying to bring across with the comment is that there is a good
reason for the predicate to exist on both, {JSFunction} as well as
{SharedFunctionInfo}, because "function->shared()->IsInterpreted()" means
something else than "function->IsInterpreted()".

[rmcilroy, 2016/11/09 16:50:10]

Good point, added a comment as-such to both functions

+
   inline void ReplaceCode(Code* code);
   inline bool HasBaselineCode() const;
 
@@ -8324,6 +8326,9 @@ class JSFunction: public JSObject {
   // Tells whether this function inlines the given shared function info.
   bool Inlines(SharedFunctionInfo* candidate);
 
+  // Tells whether or not this function is interpreted.
+  inline bool IsInterpreted();
+
   // Tells whether or not this function has been optimized.
   inline bool IsOptimized();