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_windows.go b/src/runtime/os1_windows.go
index a78eeac..9b76051 100644
--- a/src/runtime/os1_windows.go
+++ b/src/runtime/os1_windows.go
@@ -246,7 +246,7 @@
 		_STACK_SIZE_PARAM_IS_A_RESERVATION, 0)
 	if thandle == 0 {
 		println("runtime: failed to create new OS thread (have ", mcount(), " already; errno=", getlasterror(), ")")
-		gothrow("runtime.newosproc")
+		throw("runtime.newosproc")
 	}
 }
 
@@ -300,7 +300,7 @@
 		}
 	}
 	systemstack(func() {
-		gothrow("interrupt/system time is changing too fast")
+		throw("interrupt/system time is changing too fast")
 	})
 	return 0
 }