Optimize String.prototype.concat #1295
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Optimize the common case where the inputs are strings. Speeds up the string_concat2 and string_concat3 benchmarks by about 1.8x and 2.1x, the string_concat0 and string_concat1 results are unchanged. (string_concat1 became a few percent points faster but it borders on noise.)
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Optimize the common case where the inputs are strings. Speeds up the string_concat2 and string_concat3 benchmarks by about 1.8x and 2.1x, the string_concat0 and string_concat1 results are unchanged.
(string_concat1 became a few percent points faster but it borders on noise.)