cmd/compile: allow aliases to go:notinheap types

The alias doesn't need to be marked go:notinheap. It gets its
notinheap-ness from the target type.

Without this change, the type alias test in the notinheap.go file
generates these two errors:

notinheap.go:62: misplaced compiler directive
notinheap.go:63: type nih must be go:notinheap

The first is a result of go:notinheap pragmas not applying
to type alias declarations.
The second is the result of then trying to match the notinheap-ness
of the alias and the target type.

Add a few more go:notinheap tests while we are here.

Update #40954

Change-Id: I067ec47698df6e9e593e080d67796fd05a1d480f
Reviewed-on: https://go-review.googlesource.com/c/go/+/250939
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Trust: Keith Randall <khr@golang.org>
3 files changed
tree: 39ed7c727b98b889588e5d347513c65f9b36c8d2
  1. .gitattributes
  2. .github/
  3. .gitignore
  4. AUTHORS
  5. CONTRIBUTING.md
  6. CONTRIBUTORS
  7. LICENSE
  8. PATENTS
  9. README.md
  10. SECURITY.md
  11. api/
  12. doc/
  13. favicon.ico
  14. lib/
  15. misc/
  16. robots.txt
  17. src/
  18. test/
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