strings: add special cases for Join of 2 and 3 strings
We already had special cases for 0 and 1. Add 2 and 3 for now too. To be removed if the compiler is improved later (#6714). This halves the number of allocations and total bytes allocated via common filepath.Join calls, improving filepath.Walk performance. Noticed as part of investigating filepath.Walk in #16399. Change-Id: If7b1bb85606d4720f3ebdf8de7b1e12ad165079d Reviewed-on: https://go-review.googlesource.com/25005Reviewed-by:Ian Lance Taylor <iant@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
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