[turbofan] Support for typed lowering of "prototype" load from functions.
Add initial support to optimize certain "prototype" loads from known JSFunctions which have a prototype. This includes an appropriate typing rule plus a matching rule for typed lowering. R=jarin@chromium.org Review URL: https://codereview.chromium.org/1482213002 Cr-Commit-Position: refs/heads/master@{#32390}
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