Go patch committed: Push identity hash check down to subtypes

[Ian Lance Taylor]

My last patch was insufficient.  It's not enough to just treat erroneous
types as different at the top level.  The different handling has to be
done at each level; e.g., when comparing a pointer to an erroneous type
to a pointer to some other type.  This patch implements that.
Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu.
Committed to mainline.

Ian

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