path/filepath: avoid allocation in Clean of cleaned path
Alternative to https://golang.org/cl/6330044. Fixes #3681. R=golang-dev, r, hanwen, iant CC=golang-dev https://golang.org/cl/6335056
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Alternative to https://golang.org/cl/6330044. Fixes #3681. R=golang-dev, r, hanwen, iant CC=golang-dev https://golang.org/cl/6335056