* dcrt0.cc (dlL_crt0_1): Set __argc_safe after __argc is absolutely know to be

set.
* exceptions.cc (sig_handle_tty_stop): Don't reset sigCONT event since it is
reset automatically.
* fork.cc (fork): Remove obsolete usage of PID_SPLIT_HEAP.
* include/sys/cygwin.h: Ditto.
* sigproc.cc (sig_send): Use sigframe init method to set frame since it checks
for previous ownership of the frame.
* sigproc.h (sigframe::init): Accept an "is_exception" argument.

winsup/cygwin/sigproc.h

@@ -75,10 +75,10 @@ public:
     if (!oframe)
       t.get_winapi_lock ();
   }
-  inline void init (sigthread &t, DWORD ebp = (DWORD) __builtin_frame_address (0))
+  inline void init (sigthread &t, DWORD ebp = (DWORD) __builtin_frame_address (0), bool is_exception = 0)
   {
-    if (!t.frame && t.id == GetCurrentThreadId ())
-      set (t, ebp);
+    if (is_exception || (!t.frame && t.id == GetCurrentThreadId ()))
+      set (t, ebp, is_exception);
     else
       st = NULL;
   }