[vm] Unpoison spill slot area in FfiCall With register calling conventions some parameters might arrive in registers and later be spilled on the stack and addresses of those stack slots passed as handles into native code. This means we need to unpoison spill slot area otherwise MSAN will complain. Fixes https://github.com/dart-lang/sdk/issues/55179 TEST=existing msan configuration R=kustermann@google.com Fixed: 55179 Cq-Include-Trybots: luci.dart.try:vm-aot-msan-linux-release-x64-try,vm-msan-linux-release-x64-try Change-Id: I592cde9cb623c2eabc848c7a39d0453e757e97f6 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/357340 Reviewed-by: Daco Harkes <dacoharkes@google.com> Auto-Submit: Slava Egorov <vegorov@google.com> Commit-Queue: Daco Harkes <dacoharkes@google.com>
Dart is:
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