Go patch committed: Check for mismatch between results and uses

[Ian Lance Taylor]

The Go frontend had a bug in that it would not give an error for
    a, b := F()
when F returned more than two results.  This patch fixes the bug.  I've
proposed a test case for the master testsuite in
http://codereview.appspot.com/111360045 .  Bootstrapped and ran Go
testsuite on x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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