Use a pinned HTypeKnown on the receiver of the HInstanceEnvironment to
pin the type expression. When the the receiver has a wider type that
is legal for the type expression, this keeps the type expression at a
location where it is valid. Type expressions can still be hoisted if
the HTypeKnown is redundant and optimized away.
Bug: #54329
Change-Id: Iae378f9d517e3e22deca198195cad9811cf37772
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/344841
Reviewed-by: Mayank Patke <fishythefish@google.com>
Commit-Queue: Stephen Adams <sra@google.com>
Stephen Adams
7933cd741d