Go patch committed: Support three-index slices

[Ian Lance Taylor]

This patch from Chris Manghane adds support for three-index slices to
the Go frontend.  Three-index slices are new language feature in Go 1.2
(http://tip.golang.org/doc/go1.2#three_index).  Bootstrapped and ran Go
testsuite on x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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