* Disable RX workarounds on simulators: they cause host OS to crash;
* Remove Mac OS test for RX workarounds: it can cause host OS to crash;
* Remove old outdated code paths for OS versions that don't
need workarounds.
* Add code which detects whether workaround worked or not by intercepting EXC_BAD_ACCESS.
* Avoid using vm_remap in FFI callbacks when JITing, it does not work.
Instead restore old logic which manually copies page content, but adjust
FFI callbacks implementation to respect possible dual mapping.
This reworks changes done in commit
d194fcecaf after additional testing on a
wider range of hardware.
TEST=manually on physical devices and simulators
Change-Id: I339379386183c532fec25e88fa436ff0b970c2cf
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/435120
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Slava Egorov <vegorov@google.com>
Vyacheslav Egorov
dc0567c02c