all: update vendored golang.org/x/tools

Update the vendored x/tools to pick up CL 364678, which updates vet
analyzers following a change to the underlying of type parameters.

This also pulls in significant changes to the typeutil package to
support new constructs in typeutil.Map, but this is not used by vet.

The following commands were used:

  go get -d golang.org/x/tools@e212aff8fd146c44ddb0167c1dfbd5531d6c9213
  go mod tidy
  go mod vendor

Fixes #49855

Change-Id: I3ffc59f3693710c83b81d390999aeabc8043723b
Reviewed-on: https://go-review.googlesource.com/c/go/+/368774


Trust: Robert Findley <rfindley@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>