Go patch committed: Implement goto restrictions

[Ian Lance Taylor]

The Go language has clarified the use of goto.  It is now invalid to use
goto to jump into an inner block, and to use goto to jump across a
variable declaration.  This patch to the Go frontend implements these
restrictions, and adjust one library and a few test cases accordingly.
Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu.
Committed to mainline.

Ian

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