cmd/compile: Update ssa/debug_test reference files for delve and gdb

Recent changes to compiler backtraces perturbed the line
number assignment, some better, some worse, probably net
worse.  For purposes of passing the long tests, update the
reference files (delve's file was also stale).

TODO: Figure out a less delicate way to locate statement
boundaries for 1.13.

Fixes #29511.

Change-Id: If0e488341d848ba6012045b126c86b1250408d65
Reviewed-on: https://go-review.googlesource.com/c/156021


Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>