cmd/link: combine all string data into one symbol
This CL introduces a mergestrings pass after the reachability analysis to combine all reachable go.string."..." character data symbols into a single symbol. Shrinks juju by 1.2mb (1.5%). Shrinks cmd/go by 0.5% when building without DWARF. No noticable effect on linker speed. Change-Id: I2ba3e60bf418f65766bda257f6ca9eea26d895b6 Reviewed-on: https://go-review.googlesource.com/20165 Run-TryBot: David Crawshaw <crawshaw@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Ian Lance Taylor <iant@golang.org>
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