Go patch committed: Fix enclosing vars for func type in func lit

[Ian Lance Taylor]

This patch to the Go frontend fixes a dumb bug in which the enclosing
vars were incorrectly cleared when a function literal contains a
reference to a function type.  The test for this has been committed to
the master repository: http://codereview.appspot.com/121200043 .  This
fixes PR 61308.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline and 4.9 branch.

Ian

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