cmd/internal/gc: Toughen escape analysis against some bugs.
Ensures that parameter flow bits are not set for tags EscScope, EscHeap, EscNever; crash the compiler earl to expose faulty logic, rather than flake out silently downstream. Change-Id: I1428129980ae047d02975f033d56cbbd04f49579 Reviewed-on: https://go-review.googlesource.com/9601Reviewed-by:Russ Cox <rsc@golang.org>
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