tree ddf3e36bc1f265ccceec256b7c5f2c192dd27bb7
parent a69844cb1978151d1ede50356e9db61abc47d717
author Paul Berry <paulberry@google.com> 1535045508 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org> 1535045508 +0000

Fix analyzer/CFE integration of some more obscure invalid assignment cases.

This CL fixes handling of the following erroneous assignments:
- Compound assignment to postfix increment (e.g. "x++ += y;")
- Null-aware assignment to postfix increment (e.g. "x++ ??= y;")

There is some code duplication in ContextAwareGenerator now; I will
clean that up in a follow-up CL.

Change-Id: If68bc267b67904562bf8c2e705123d04fdf0b69a
Reviewed-on: https://dart-review.googlesource.com/71321
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>