go patch committed: Give error on label defined but not used

[Ian Lance Taylor]

The Go language says that it is an error to define a label but not use
it.  This patch adds that error to the gccgo frontend.  The patch
includes some changes to the testsuite to avoid new errors.
Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu.
Committed to mainline.

Ian

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