[gccgo] Localize identifiers in error messages

[Ian Lance Taylor]

This patch consistently localizes identifiers in error messages.  This
ensures that hidden names will always be displayed in a user friendly
form.  It also localizes Go's UTF-8 identifiers for the user's
environment, in the unlikely event that somebody is using UTF-8
identifiers but not using a UTF-8 locale.  Committed to gccgo branch.

Ian

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