cmd/compile: handle zero-sized values more generally

Introduce a new zero-arg op, Empty, which builds a zero-sized value.
This is like ArrayMake0 but can make more general zero-sized values,
like those of type [2][0]int.

Needed for the subsequent CL.

Update #77635

Change-Id: If928e9677be5d40a4e2d7501dada66e062319711
Reviewed-on: https://go-review.googlesource.com/c/go/+/747761
Reviewed-by: Junyang Shao <shaojunyang@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
11 files changed
tree: 88e56be8bcd0e608b23589e9123ee017604e3751
  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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