[builtins] Port the String.prototype.codePointAt builtin to CSA.
We already have all the functionality available in the CodeStubAssembler, so this is merely connecting the dots. Drive-by-fix: Improve code generation for StringCharCodeAt to properly mark runtime entries as deferred and just use a single slow-path. Bug: v8:5049 Change-Id: I76793c823b23f676e65cdb717558473edb6b91cd Reviewed-on: https://chromium-review.googlesource.com/577533 Commit-Queue: Benedikt Meurer <bmeurer@chromium.org> Reviewed-by: Jakob Gruber <jgruber@chromium.org> Cr-Commit-Position: refs/heads/master@{#46774}
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