cmd/compile/internal/types: remove TTYPEPARAM and TUNION types

These were used by the nounified frontend for representing
uninstantiated generic types; however, the unified frontend only needs
types1 to represent instantiated types.

Updates #57410.

Change-Id: Iac417fbf2b86f4e08bd7fdd26ae8ed17395ce833
Reviewed-on: https://go-review.googlesource.com/c/go/+/458621
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
8 files changed
tree: a1d8996712bcf76e58c120b1dbcdd6ffa9ae658b
  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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