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

src/compiler.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler.h"
 
 #include <algorithm>
 #include <memory>
 
 #include "src/asmjs/asm-js.h"
@@ skipping 1231 matching lines @@
     // The existing unoptimized code was replaced with the new one.
     RecordFunctionCompilation(CodeEventListener::LAZY_COMPILE_TAG,
                               &unoptimized);
   }
   return true;
 }
 
 // static
 Compiler::CompilationTier Compiler::NextCompilationTier(JSFunction* function) {
   Handle<SharedFunctionInfo> shared(function->shared(), function->GetIsolate());
-  if (shared->code()->is_interpreter_trampoline_builtin()) {
+  if (shared->IsInterpreted()) {
     if (UseTurboFan(shared)) {
       return OPTIMIZED;
     } else {
       return BASELINE;
     }
   } else {
     return OPTIMIZED;
   }
 }
 
@@ skipping 442 matching lines @@
     DCHECK(shared->is_compiled());
     function->set_literals(cached.literals);
   } else if (shared->is_compiled()) {
     // TODO(mvstanton): pass pretenure flag to EnsureLiterals.
     JSFunction::EnsureLiterals(function);
   }
 }
 
 }  // namespace internal
 }  // namespace v8