runtime: rename gothrow to throw

Rename "gothrow" to "throw" now that the C version of "throw"
is no longer needed.

This change is purely mechanical except in panic.go where the
old version of "throw" has been deleted.

sed -i "" 's/[[:<:]]gothrow[[:>:]]/throw/g' runtime/*.go

Change-Id: Icf0752299c35958b92870a97111c67bcd9159dc3
Reviewed-on: https://go-review.googlesource.com/2150
Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Dave Cheney <dave@cheney.net>
diff --git a/src/runtime/os1_darwin.go b/src/runtime/os1_darwin.go
index 984b881..3a5ed7c 100644
--- a/src/runtime/os1_darwin.go
+++ b/src/runtime/os1_darwin.go
@@ -64,9 +64,9 @@
 	if !iscgo {
 		if bsdthread_register() != 0 {
 			if gogetenv("DYLD_INSERT_LIBRARIES") != "" {
-				gothrow("runtime: bsdthread_register error (unset DYLD_INSERT_LIBRARIES)")
+				throw("runtime: bsdthread_register error (unset DYLD_INSERT_LIBRARIES)")
 			}
-			gothrow("runtime: bsdthread_register error")
+			throw("runtime: bsdthread_register error")
 		}
 	}
 }
@@ -84,7 +84,7 @@
 
 	if errno < 0 {
 		print("runtime: failed to create new OS thread (have ", mcount(), " already; errno=", -errno, ")\n")
-		gothrow("runtime.newosproc")
+		throw("runtime.newosproc")
 	}
 }
 
@@ -114,7 +114,7 @@
 
 func macherror(r int32, fn string) {
 	print("mach error ", fn, ": ", r, "\n")
-	gothrow("mach error")
+	throw("mach error")
 }
 
 const _DebugMach = false
@@ -395,7 +395,7 @@
 }
 
 func setsigstack(i int32) {
-	gothrow("setsigstack")
+	throw("setsigstack")
 }
 
 func getsig(i int32) uintptr {