[turbofan] Prepare mechanism to enable TF on language subset.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 94c04c68eae9e739067e7c684a7ddd7b555c6a05..ac88ec8ee13d4f8b51b9557da6804803a555a5ad 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -7135,6 +7135,9 @@ class SharedFunctionInfo: public HeapObject {
   // Is this a function or top-level/eval code.
   DECL_BOOLEAN_ACCESSORS(is_function)
 
+  // Indicates that code for this function cannot be compiled with Crankshaft.
+  DECL_BOOLEAN_ACCESSORS(dont_crankshaft)
+
   // Indicates that code for this function cannot be cached.
   DECL_BOOLEAN_ACCESSORS(dont_cache)
 
@@ -7399,6 +7402,7 @@ class SharedFunctionInfo: public HeapObject {
     kIsAnonymous,
     kNameShouldPrintAsAnonymous,
     kIsFunction,
+    kDontCrankshaft,
     kDontCache,
     kDontFlush,
     kIsArrow,