[dart2wasm] Support IntersectionType in translateStorageType
[dart2wasm] Support IntersectionType in translateStorageType

Fixes breakage of barista3 introduced in
https://dart-review.googlesource.com/c/sdk/+/253665

Change-Id: Ia4a6bf4da51d450de4184c7daff50aa9f3848df5
Cq-Include-Trybots: luci.dart.try:dart2wasm-linux-x64-d8-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/255996
Reviewed-by: Joshua Litt <9f8daed1ab51574c9a48ffacb03e4a1adb4f880c@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk