[esnext] Implement String.prototype.{trimStart,trimEnd}
Until now, String.prototype.{trimLeft,trimRight} were non-standard language extensions, required for Web compatibility. The proposal at https://github.com/tc39/proposal-string-left-right-trim standardizes this functionality as String.prototype.{trimStart,trimEnd}, and defines String.prototype.{trimLeft,trimRight} as aliases for backwards compatibility. This patch implements that proposal behind the --harmony-string-trimming flag. Bug: v8:6530 Change-Id: Id21e624c12a79e6b782efb049a48901b9da7db71 Reviewed-on: https://chromium-review.googlesource.com/867044 Commit-Queue: Mathias Bynens <mathias@chromium.org> Reviewed-by:Sathya Gunasekaran <gsathya@chromium.org> Reviewed-by:
Benedikt Meurer <bmeurer@chromium.org> Reviewed-by:
Yang Guo <yangguo@chromium.org> Cr-Commit-Position: refs/heads/master@{#50717}
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test/mjsunit/string-trim.js
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