instrumentation (mostly) for DATAS

[Maoni0]

add instru to help with DATAS debugging

• record heap count change history on blocking GC threads and BGC threads (I'm including a change to get the m_OSThreadId field of the Thread object since we recently discovered an issue where GC indicates a BGC thread was successfully created yet that field is 0. I'm only recording this on the OS we discovered this on. for future releases we should get it properly via a GCToEEInterface method)
• record BGC thread creation history

record LLC size to help with gen0 min size debugging

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/gc
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[janvorli]

LGTM, thank you!

[Maoni0]

/backport to release/9.0

[github-actions]

Started backporting to release/9.0: https://github.com/dotnet/runtime/actions/runs/10882418393

[mangod9]

Filled a known issue for the numerics failures. dotnet/dnceng#4082

[Maoni0]

/backport to release/9.0

[github-actions]

Started backporting to release/9.0: https://github.com/dotnet/runtime/actions/runs/10891400472

[github-actions]

@Maoni0 backporting to release/9.0 failed, the patch most likely resulted in conflicts:

$ git am --3way --empty=keep --ignore-whitespace --keep-non-patch changes.patch

Applying: added instru to help with DATAS debugging + record LLC size to help with gen0 min size debugging
.git/rebase-apply/patch:349: trailing whitespace.
    hc_record_inactive_waiting = 7, 
.git/rebase-apply/patch:456: trailing whitespace.
        // bgc_thread_running was false but bgc_thread was true. 
.git/rebase-apply/patch:475: trailing whitespace.
    // though it was not in progress when we check before calling it. 
warning: 3 lines add whitespace errors.
Using index info to reconstruct a base tree...
M	src/coreclr/gc/gc.cpp
M	src/coreclr/gc/gcpriv.h
Falling back to patching base and 3-way merge...
Auto-merging src/coreclr/gc/gcpriv.h
CONFLICT (content): Merge conflict in src/coreclr/gc/gcpriv.h
Auto-merging src/coreclr/gc/gc.cpp
CONFLICT (content): Merge conflict in src/coreclr/gc/gc.cpp
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config advice.mergeConflict false"
Patch failed at 0001 added instru to help with DATAS debugging + record LLC size to help with gen0 min size debugging
Error: The process '/usr/bin/git' failed with exit code 128

Please backport manually!

[github-actions]

@Maoni0 an error occurred while backporting to release/9.0, please check the run log for details!

Error: git am failed, most likely due to a merge conflict.

[cshung]

LGTM, thanks!

[cshung]

LGTM, thanks!

[Maoni0]

/ba-g known issue dotnet/dnceng#3879

[Maoni0]

merging since that linux-x64 debug lib job isn't making any progress due to the dnceng issue.

thanks for all the reviews!!