go/ssa: distinguish goto from continue for range-over-func

[cpunion]

go/ssa currently maps both goto L and continue L to the yield
continuation when L labels a range-over-func statement. A goto L must
instead stop the current iterator call and resume at the parent
function's label so that the range statement restarts.

Keep continue L targeting the yield continuation, but point goto L at
the parent's existing label block. The normal cross-function exit
lowering then records and resumes the jump correctly.

The interpreter regression test distinguishes the two operations by
restarting the same labeled range twice.

Fixes golang/go#80860.

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Patch Set 1:

(1 comment)

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Message from Jie Li:

Patch Set 2:

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