[turbofan] Introduce a dedicated StringCharAt operator.
Previously String element access and String.prototype.charAt were lowered to a subgraph StringFromCharCode(StringCharCodeAt(s, k)), however that can be fairly expensive both runtime and compile time wise. The dedicated StringCharAt operator is implemented via a call to a builtin that does exactly this. R=yangguo@chromium.org Review-Url: https://codereview.chromium.org/2599683002 Cr-Commit-Position: refs/heads/master@{#41909}
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