cmd/compile: prefer base.Fatalf to panic in dwarfgen
Updates a few spots which call `panic` to instead call `base.Fatalf`.
Change-Id: I30b73c7994caa647245b0e253f20e0b88185e644
GitHub-Last-Rev:
b3839bbe424294f92a1f9448e5e0ac074e722e4d
GitHub-Pull-Request: golang/go#74616
Reviewed-on: https://go-review.googlesource.com/c/go/+/688035
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>