Go patch committed: Don't merge dot-import names

[Ian Lance Taylor]

This patch to the Go frontend fixes it so that a name included because
of a dot import (import . "package") is not merged with the same name
defined in an earlier file.  Without this patch, the Go compiler would
incorrectly accept code that used a name defined by a dot import in a
later file.  I've sent out a change to add a test to the master
testsuite: http://codereview.appspot.com/118000043 .  For this patch,
bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu.
Committed to mainline.

Ian

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