[turbofan] Introduce CheckString simplified operator.
Introduce the CheckString during native context specialization when we have string map feedback on a LOAD_IC/STORE_IC. The CheckString operator, just like its CheckNumber pendant, renames the input and assigns a proper type, which we will use soon to lower access operations on Strings, i.e. charCodeAt calls or keyed accesses. R=jarin@chromium.org BUG=v8:4930,v8:5141 Review-Url: https://codereview.chromium.org/2181943003 Cr-Commit-Position: refs/heads/master@{#38076}
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