Go patch committed: Don't encode non-ASCII characters in identifiers

[Ian Lance Taylor]

Go permits non-ASCII characters in identifiers.  A long time ago I
thought I needed to encode those before passing them to GIMPLE.  Looking
at the -fextended-identifiers support, I see that that should not be
true.  This patch removes the encoding.  This should give a better
debugging experience and will fix the names used in type reflection.
Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu.
Committed to mainline.

Ian

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