As the powerset grows, the cache needs to be keyed on both the base and
the full flags. While we're at it, we ensure that all FlatTypeMask
allocations go via the cache.
Change-Id: Ifdd400bf4ea23a936c4d37be91a5d527102aa3b4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/413700
Reviewed-by: Nate Biggs <natebiggs@google.com>
Commit-Queue: Mayank Patke <fishythefish@google.com>
Mayank Patke
1bbbf26434