[interpreter] Elide OSR polling from fake loops.
This makes sure we are not inserting {OsrPoll} instructions for any statements that are not actually loops and have no back edges. Without back edges the {BytecodeGraphBuilder} is unable to deduce loop ranges and hence cannot construct a graph for OSR entry. R=neis@chromium.org TEST=mjsunit/regress/regress-5252 BUG=v8:5252 Review-Url: https://codereview.chromium.org/2200733002 Cr-Commit-Position: refs/heads/master@{#38233}
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