JIT compilation should put all JIT meta-data into JITCode or one of its subclasses and leave CodeBlock unchanged 
https://bugs.webkit.org/show_bug.cgi?id=159061
Summary JIT compilation should put all JIT meta-data into JITCode or one of its subcl...
Filip Pizlo
Reported 2016-06-23 11:00:18 PDT
In such a world, we won't have to create a cloned CodeBlock for tier-up.
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