Go patch committed: Implement predefined error interface

[Ian Lance Taylor]

The Go language recently added a new predefined type, named "error",
which is an interface type with a single method, Error.  This patch,
from Rémy Oudompheng, implements this type for gccgo.  Bootstrapped and
ran Go testsuite on x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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