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[release/7.0] Fix write barriers in NativeAOT - #74455
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jeffschwMSFT
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Aug 23, 2022
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approved. We can merge once we have a green ci.
carlossanlop
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Aug 24, 2022
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Approved and signed off.
CI is green.
Ready to merge. 
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Backport of #74325 to release/7.0
/cc @AntonLapounov
Customer Impact
The server GC mode for NativeAOT-compiled apps is broken on Linux and Windows ARM64 due to write barriers never updating the card table. Applications crash at random places. In particular, that affects our own crossgen2 compiler.
Testing
Risk
The changes in this PR are effectively ARM64 only. The rest is either under
#ifdef WRITE_BARRIER_CHECK, which is not defined by official builds, or for architectures we do not support at present (x86, ARM32).