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Add umtx system call support.

--- a/lib/sys/sys+freebsd-x64.myr

+++ b/lib/sys/sys+freebsd-x64.myr

@@ -14,6 +14,7 @@

 	type filemode	= uint16

 	type filetype	= uint8

 	type fcntlcmd	= int64

+	type umtxop	= int32

 	type clock = union

 		`Clockrealtime

@@ -250,6 +251,31 @@

 	/* return value for a failed mapping */

 	const Mapbad	: byte# = -1 castto(byte#)

+	/* umtx ops */

+	const Umtxlock	: umtxop = 0

+	const Umtxunlock	: umtxop = 1

+	const Umtxwait	: umtxop = 2

+	const Umtxwake	: umtxop = 3

+	const UmtxmtxTrylock	: umtxop = 4

+	const Umtxmtxlock	: umtxop = 5

+	const Umtxmtxunlock	: umtxop = 6

+	const Umtxsetceiling	: umtxop = 7

+	const Umtxcvwait	: umtxop = 8

+	const Umtxcvsignal	: umtxop = 9

+	const Umtxcvbroadcast	: umtxop = 10

+	const Umtxwaituint	: umtxop = 11

+	const Umtxrwrdlock	: umtxop = 12

+	const Umtxrwwrlock	: umtxop = 13

+	const Umtxrwunlock	: umtxop = 14

+	const Umtxwaituintpriv	: umtxop = 15

+	const Umtxwakepriv	: umtxop = 16

+	const Umtxmutexwait	: umtxop = 17

+	const Umtxsemwait	: umtxop = 19

+	const Umtxsemwake	: umtxop = 20

+	const Umtxnwakepriv	: umtxop = 21

+	const Umtxmtxwake2	: umtxop = 22

+	const Umtxmax	: umtxop = 23

+

 	/* syscalls */

 	const Syssyscall                   : scno = 0

 	const Sysexit                      : scno = 1

@@ -678,6 +704,7 @@

 	/* thread control */

 	const thr_new	: (param : thrparam#, paramsz : int -> int)

 	const thr_exit	: (state : int64# -> void)

+	const umtx_op	: (obj : void#, op : umtxop, val : uint64, a1 : void#, a2 : void# -> int)

 	/* fd manipulation */

 	const open	: (path:byte[:], opts:fdopt -> fd)

@@ -796,8 +823,9 @@

 /* thread management */

-const thr_new	= {param, sz;	-> syscall(Systhr_create, a(param), a(sz)) castto(int)}

+const thr_new	= {param, sz;	-> syscall(Systhr_new, a(param), a(sz)) castto(int)}

 const thr_exit	= {state;	syscall(Systhr_exit, a(state))}

+const umtx_op	= {obj, op, val, a1, a2; -> syscall(Sys_umtx_op, a(obj), a(op), a(val), a(a1), a(a2)) castto(int)}

 /* fd manipulation */

 const open	= {path, opts;		-> syscall(Sysopen, cstring(path), a(opts), a(0o777)) castto(fd)}

--- a/parse/infer.c

+++ b/parse/infer.c

@@ -2476,8 +2476,8 @@

 		if (s->impl.vis != Visexport)

 			continue;

 		nodetag(st, s, 0, hidelocal);

-		for (i = 0; i < tr->naux; i++)

-			tr->aux[i]->vis = Visexport;

+		for (j = 0; j < tr->naux; j++)

+			tr->aux[j]->vis = Visexport;

 	}

 	free(k);