Another assertion fix for debug builds after r175846.

generateByIdStub() can now be called with an empty prototype chain
if kind == GetUndefined, so tweak the assertion to cover that.

* jit/Repatch.cpp:
(JSC::generateByIdStub):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@175880 268f45cc-cd09-0410-ab3c-d52691b4dbfc
webkitpy test fix after r175867
https://bugs.webkit.org/show_bug.cgi?id=138607

Reviewed by Philippe Normand.

* Scripts/webkitpy/port/linux_get_crash_log_unittest.py:
(GDBCrashLogGeneratorTest.test_generate_crash_log):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@175887 268f45cc-cd09-0410-ab3c-d52691b4dbfc