__arm macro meaning and purpose

Hi,

We observe that there are several macros being defined in ARMCLANG. It would be helpful, if we know the meaning or purpose of these macros and will help us to use these macros judiciously:

[11864215]__arm64
[11864216]__arm64__
[11903057]__arm
[11903060]__arm__

Thanks,
Malli

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