Fix nogo test error

Signed-off-by: Howard Zhang <howard.zhang@arm.com>

pkg/ring0/lib_arm64.go

@@ -62,9 +62,10 @@ func LoadFloatingPoint(*byte)
 // SaveFloatingPoint saves floating point state.
 func SaveFloatingPoint(*byte)
 
+// FPSIMDDisableTrap disables fpsimd.
 func FPSIMDDisableTrap()
 
-// DisableVFP disables fpsimd.
+// FPSIMDEnableTrap enables fpsimd.
 func FPSIMDEnableTrap()
 
 // Init sets function pointers based on architectural features.

pkg/sentry/arch/fpu/fpu_arm64.go

@@ -58,6 +58,8 @@ func (s *State) Fork() State {
 }
 
 // BytePointer returns a pointer to the first byte of the state.
+//
+//go:nosplit
 func (s *State) BytePointer() *byte {
 	return &(*s)[0]
 }