Go patch committed: Don't crash on self-referential initializer

[Ian Lance Taylor]

This patch to the Go frontend avoids a crash when a variable initializer
erroneously refers to the variable itself.  We already avoided many such
crashes, but not in cases where lowering the initializer changes the
initializer itself.  This patch fixes cases like that.  Bootstrapped and
ran Go testsuite on x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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