cmd/compile: change some unreachable code paths into Fatalf

Now that GOEXPERIMENT=nounified is removed, we can assume InlineCall
and HaveInlineBody will always be overridden with the unified
frontend's implementations. Similarly, we can assume expandDecl will
never be called.

This CL changes the code paths into Fatalfs, so subsequent CLs can
remove all the unreachable code.

Updates #57410.

Change-Id: I2a0c3edb32916c30dd63c4dce4f1bd6f18e07468
Reviewed-on: https://go-review.googlesource.com/c/go/+/458618
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
3 files changed
tree: 3a609df982e94eb430d9930353163f0da90e83a0
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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