Go patch committed: Fix identical unnamed structs with methods

[Ian Lance Taylor]

When gccgo saw multiple identical unnamed structs with methods assigned
to interfaces that used those methods, it would emit multiple copies of
the interface method table, causing a duplicate symbol error from the
assembler.  This patch fixes the bug.  I added a test case to the master
testsuite that will be copied in the gccgo testsuite in due course.
Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu.
Committed to mainline and 4.8 branch.

Ian

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