fd: sprinkle some predits around fget
clang inlines fget -> _fget into kern_fstat and eliminates several checkes,
but prior to this change it would assume fget_unlocked was likely to fail
and consequently avoidable jumps got generated.
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Description
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mjg Authored on - Parents
- rS357405: fd: use atomic_load_ptr instead of hand-rolled cast through volatile
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