add ability to set GCName via runtimeconfig.

[mangod9]

gcname was only enabled via DOTNET_GCName, this change enables setting it via System.GC.GCName in runtimeconfig.json.

[cshung]

@mrsharm, shall we update the behavior of the GetConfigurationVariables API?

[mrsharm]

@mrsharm, shall we update the behavior of the GetConfigurationVariables API?

Sure - will work on this.

[mangod9]

There is a CI issue which is blocking re-running the wasm leg. It had passed on the previous run so this should be good to merge. Please CR.

[mrsharm]

LGTM - I'll be following this PR up with updating our GC Configs so that this configuration shows up in our GetConfigurationVariables API.

[mangod9]

LGTM - I'll be following this PR up with updating our GC Configs so that this configuration shows up in our GetConfigurationVariables API.

I plan to backport this to 7, would the API change require porting to 7 as well?

[mrsharm]

LGTM - I'll be following this PR up with updating our GC Configs so that this configuration shows up in our GetConfigurationVariables API.

I plan to backport this to 7, would the API change require porting to 7 as well?

Since the change will be a trivial and risk-free one, I think we could add the changes to gcconfig.h in one PR i.e. for the backport, merge the changes from this PR and the one I plan to create (which should be a few lines only).

[mrsharm]

Added the new config to gcconfig.h and now the GetConfigurationVariables call outputs:

{ ServerGC : False }
{ ConcurrentGC : True }
{ RetainVM : False }
{ NoAffinitize : False }
{ GCCpuGroup : False }
{ GCLargePages : False }
{ HeapCount : 1 }
{ GCHeapAffinitizeMask : 0 }
{ GCHeapAffinitizeRanges :  }
{ GCHighMemPercent : 0 }
{ GCHeapHardLimit : 0 }
{ GCHeapHardLimitPercent : 0 }
{ GCHeapHardLimitSOH : 0 }
{ GCHeapHardLimitLOH : 0 }
{ GCHeapHardLimitPOH : 0 }
{ GCHeapHardLimitSOHPercent : 0 }
{ GCHeapHardLimitLOHPercent : 0 }
{ GCHeapHardLimitPOHPercent : 0 }
{ GCConserveMem : 0 }
{ GCName :  }

[mangod9]

/backport to release/7.0

[github-actions]

Started backporting to release/7.0: https://github.com/dotnet/runtime/actions/runs/3002894605