Fix broken go:nosplit directive
Fix broken go:nosplit directive

There must be no space in "//go:nosplit". This probably never
caused problems because the function is so simple it is almost
certainly inlined.

PiperOrigin-RevId: 464823961

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor