Removed erroneous use of 'PROCESSOR_ARCHITECTURE' Enviroment variable (dotnet/coreclr#22743)
Removed erroneous use of 'PROCESSOR_ARCHITECTURE' Enviroment variable
Changed all uses of 'Enviroment.GetEnviromentVariable("PROCESSOR_ARCHITECTURE")'
to usage of 'System.Runtime.InteropServices.RuntimeInformation.ProcessArchitecture'
and 'enum System.Runtime.InteropServices.Architecture'.
Fix dotnet/coreclr#22694
Commit migrated from https://github.com/dotnet/coreclr/commit/
333232d98639df980133205c41791cb9dc7f3d34