cmd/compile: apply FixVariadicCall and FixMethodCall during typecheck

To simplify backend analysis, we normalize variadic and method calls:
variadic calls are rewritten with an explicit slice argument, and
method calls are turned into function calls that pass the receiver
argument as the first parameter.

But because we've been supporting multiple frontends, this
normalization was scattered in various later passes. Now that we're
back to just one frontend, we can move the normalization forward into
typecheck (where most other IR normalization already happens).

Change-Id: Idd05ae231fc180ae3dd1664452414f6b6d578962
Reviewed-on: https://go-review.googlesource.com/c/go/+/463737
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
4 files changed
tree: 753ffd849ef8fe4a0e6e0bf7f87b32c700524cb0
  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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