go/types: rename isX predicates to allX, add simple is_X (step 1 of 2)

This is a port of CL 360955 to go/types. Note that go/types and types2
differ in handling of untyped nil within both Checker.shift and
Checker.implicitTypeAndValue.

A missing comment was added to Checker.indexExpr.

Change-Id: Ia9149ff9c0af68213c579090902ab7989828ddd2
Reviewed-on: https://go-review.googlesource.com/c/go/+/362534
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
9 files changed
tree: 53b0382bff779a6b4bff19e3f505a2e2bed3a3f2
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. codereview.cfg
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. LICENSE
  15. PATENTS
  16. README.md
  17. SECURITY.md
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