encoding/xml: avoid an allocation for tags without attributes
Before, an array of size 4 would always be allocated even if a tag doesn't have any attributes. Now that array is allocated only if needed. benchmark old allocs new allocs delta BenchmarkUnmarshal 191 176 -8.5% Change-Id: I4d214b228883d0a6e892c0d6eb00dfe2da84c116 Reviewed-on: https://go-review.googlesource.com/4160Reviewed-by:Brad Fitzpatrick <bradfitz@golang.org>
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