Reland^2 "Don't compile functions in a context the caller doesn't have access to"

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 2ff7ee46cc5156935b458f3a2d1ca9e788cc4750..06d55ef5d7bd9d9a901f86a9e0ccc7300b4b5292 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -588,6 +588,10 @@ DEFINE_BOOL(builtins_in_stack_traces, false,
             "show built-in functions in stack traces")
 DEFINE_BOOL(disable_native_files, false, "disable builtin natives files")
 
+// builtins.cc
+DEFINE_BOOL(allow_unsafe_function_constructor, false,
+            "allow invoking the function constructor without security checks")
+
 // builtins-ia32.cc
 DEFINE_BOOL(inline_new, true, "use fast inline allocation")