[llvm][docs] Refresh Arm builtins cross compile guide #150966
Merged
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Someone asked about this on Discord and it was a bit hard to follow. I found them a config that worked, but the doc was not as much help as it should have been.
It probably needs some updates for the runtime build era, but for now, I'm just making it easier to read. I know the basic build can work at least.
Some aspects of it may be literally wrong now, but I'll check that later.