Implement AppleSilicon FlushProcessWriteBuffers

[sdmaclea]

Fixes #41993

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Issue Details

Description:
Author:	sdmaclea
Assignees:	sdmaclea
Labels:	arch-arm64, area-GC-coreclr, os-mac-os-x-big-sur
Milestone:	[object Object]

[sdmaclea]

@janvorli This compiles ... Will test further after an initial review.

[sdmaclea]

So for the fallback to work on osx-x64, we need thread_get_register_pointer_values which requires macosx(10.14). We are currently compiling osx-x64 with set(MACOS_VERSION_MIN_FLAGS -mmacosx-version-min=10.13).

I'll change the minimum in this PR for now, but we may want to abandon the fallback until we officially decide to move the minimum macosx version.

[janvorli]

So for the fallback to work on osx-x64, we need thread_get_register_pointer_values which requires macosx(10.14). We are currently compiling osx-x64 with set(MACOS_VERSION_MIN_FLAGS -mmacosx-version-min=10.13).

Hm, I haven't realized that. I am not sure what is our policy for updating the official minimum macOS version, but I believe we need to make that decision before getting the fallback part of the change in.

[sdmaclea]

OK I 'll split the osx-arm64 osx-x64 changes.

[janvorli]

LGTM, thank you!

[k15tfu]

but I believe we need to make that decision before getting the fallback part of the change in

@janvorli Can you please ping me when the decision is made, I'm interested in that.

[ViktorHofer]

// Auto-generated message

69e114c which was merged 12/7 removed the intermediate src/coreclr/src/ folder. This PR needs to be updated as it touches files in that directory which causes conflicts.

To update your commits you can use this bash script: https://gist.github.com/ViktorHofer/6d24f62abdcddb518b4966ead5ef3783. Feel free to use the comment section of the gist to improve the script for others.