runtime: nmspinning's position in struct schedt

[mygrsun]

i think the nmspinning's position in struct schedt in runtime should be writen in the "m" part instead of "p" part

current is

	midle        muintptr // idle m's waiting for work
	nmidle       int32    // number of idle m's waiting for work
	nmidlelocked int32    // number of locked m's waiting for work
	mnext        int64    // number of m's that have been created and next M ID
	maxmcount    int32    // maximum number of m's allowed (or die)
	nmsys        int32    // number of system m's not counted for deadlock
	nmfreed      int64    // cumulative number of freed m's

	ngsys uint32 // number of system goroutines; updated atomically

	pidle      puintptr // idle p's
	npidle     uint32
	nmspinning uint32 // See "Worker thread parking/unparking" comment in proc.go.

i think it should like this:

	midle        muintptr // idle m's waiting for work
	nmidle       int32    // number of idle m's waiting for work
	nmidlelocked int32    // number of locked m's waiting for work
	mnext        int64    // number of m's that have been created and next M ID
	maxmcount    int32    // maximum number of m's allowed (or die)
	nmsys        int32    // number of system m's not counted for deadlock
	nmfreed      int64    // cumulative number of freed m's
	nmspinning uint32 // See "Worker thread parking/unparking" comment in proc.go.

	ngsys uint32 // number of system goroutines; updated atomically

	pidle      puintptr // idle p's
	npidle     uint32

[dmitshur]

Thanks for reporting. Is this just a suggested readability improvement, or do you think there is another problem there?

/cc @aclements

[mygrsun]

suggested readability improvement