cmd/compile: fix invalid code generation for OINDEXMAP

CL 736020 replaced calls to mapaccess1 with mapaccess2*. The main
purpose is reducing the code duplication in runtime, since they are
shared the same implementation.

However, inside the compiler, OINDEXMAP is used in expression context.
Thus it's not safe to replace the mapaccess1 by mapaccess2 calls late in
the compiler frontend.

Updates #73196
Fixes #80096

Change-Id: Ia510b947dc362168dacd55b0b57ad875f8a58bcf
Reviewed-on: https://go-review.googlesource.com/c/go/+/793000
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
4 files changed
tree: 8e2582786a85eb5d29f69879ee7961585b30b27e
  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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