Go patch committed: Better handling of invalid ASCII in Go frontend

[Ian Lance Taylor]

This patch improves the handling of invalid ASCII characters in the Go
frontend when they appear in identifiers.  Note that Go input is by
definition always UTF-8, so the ASCII-specific assumptions here are OK.
Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu.
Committed to mainline.  Will commit to 4.8 branch when it reopens.

Ian

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