[turbofan] Make sure Operator is really immutable.
Make Operator const-correct in preparation for allocating sharing Operators across different isolates (using LazyInstance). TEST=cctest,compiler-unittests,mjsunit R=svenpanne@chromium.org Review URL: https://codereview.chromium.org/539933002 git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23677 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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