[turbofan] Introduce dedicated StringIndexOf operator.
The StringIndexOf operation is pure on the JS level, but the actual stub call must be in the effect chain later so that the Scheduler doesn't place it inside some allocation region (The %StringIndexOf runtime function may trigger a GC for string flattening). BUG=chromium:685580 R=jarin@chromium.org Review-Url: https://codereview.chromium.org/2657243002 Cr-Commit-Position: refs/heads/master@{#42736}
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