runtime: merge the darwin os*.go files together

Merge them together into os1_darwin.go. A future CL will rename it.

Change-Id: Ia4380d3296ebd5ce210908ce3582ff184566f692
Reviewed-on: https://go-review.googlesource.com/22004
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/runtime/os1_darwin.go

@@ -6,11 +6,23 @@ package runtime
 
 import "unsafe"
 
-//extern SigTabTT runtime·sigtab[];
+type mOS struct {
+	machport uint32 // return address for mach ipc
+	waitsema uint32 // semaphore for parking on locks
+}
 
-type sigset uint32
+func bsdthread_create(stk, arg unsafe.Pointer, fn uintptr) int32
+func bsdthread_register() int32
 
-var sigset_all = ^sigset(0)
+//go:noescape
+func mach_msg_trap(h unsafe.Pointer, op int32, send_size, rcv_size, rcv_name, timeout, notify uint32) int32
+
+func mach_reply_port() uint32
+func mach_task_self() uint32
+func mach_thread_self() uint32
+
+//go:noescape
+func sysctl(mib *uint32, miblen uint32, out *byte, size *uintptr, dst *byte, ndst uintptr) int32
 
 func unimplemented(name string) {
 	println(name, "not implemented")
@@ -473,6 +485,38 @@ func memlimit() uintptr {
 	return 0
 }
 
+const (
+	_NSIG        = 32
+	_SI_USER     = 0 /* empirically true, but not what headers say */
+	_SIG_BLOCK   = 1
+	_SIG_UNBLOCK = 2
+	_SIG_SETMASK = 3
+	_SS_DISABLE  = 4
+)
+
+//go:noescape
+func sigprocmask(how uint32, new, old *sigset)
+
+//go:noescape
+func sigaction(mode uint32, new *sigactiont, old *usigactiont)
+
+//go:noescape
+func sigaltstack(new, old *stackt)
+
+func sigtramp()
+
+//go:noescape
+func setitimer(mode int32, new, old *itimerval)
+
+func raise(sig int32)
+func raiseproc(int32)
+
+//extern SigTabTT runtime·sigtab[];
+
+type sigset uint32
+
+var sigset_all = ^sigset(0)
+
 //go:nosplit
 //go:nowritebarrierrec
 func setsig(i int32, fn uintptr, restart bool) {

src/runtime/os2_darwin.go

-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package runtime
-
-const (
-	_NSIG        = 32
-	_SI_USER     = 0 /* empirically true, but not what headers say */
-	_SIG_BLOCK   = 1
-	_SIG_UNBLOCK = 2
-	_SIG_SETMASK = 3
-	_SS_DISABLE  = 4
-)

src/runtime/os_darwin.go

-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package runtime
-
-import "unsafe"
-
-type mOS struct {
-	machport uint32 // return address for mach ipc
-	waitsema uint32 // semaphore for parking on locks
-}
-
-func bsdthread_create(stk, arg unsafe.Pointer, fn uintptr) int32
-func bsdthread_register() int32
-
-//go:noescape
-func mach_msg_trap(h unsafe.Pointer, op int32, send_size, rcv_size, rcv_name, timeout, notify uint32) int32
-
-func mach_reply_port() uint32
-func mach_task_self() uint32
-func mach_thread_self() uint32
-
-//go:noescape
-func sysctl(mib *uint32, miblen uint32, out *byte, size *uintptr, dst *byte, ndst uintptr) int32
-
-//go:noescape
-func sigprocmask(how uint32, new, old *sigset)
-
-//go:noescape
-func sigaction(mode uint32, new *sigactiont, old *usigactiont)
-
-//go:noescape
-func sigaltstack(new, old *stackt)
-
-func sigtramp()
-
-//go:noescape
-func setitimer(mode int32, new, old *itimerval)
-
-func raise(sig int32)
-func raiseproc(int32)