[vm] Change missed Hashcode -> Hash() from CL submitted in parallel.
[vm] Change missed Hashcode -> Hash() from CL submitted in parallel.

TEST=Build succeeds.

Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-release-x64-try
Change-Id: Idc107eb4e84e7e80cdb87454c2c6e27787682525
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/195262
Reviewed-by: Tess Strickland <cce218d042444252b7ac446d60910fca7732559c@google.com>
Commit-Queue: Tess Strickland <cce218d042444252b7ac446d60910fca7732559c@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