* exceptions.cc (setup_handler): Avoid suspending a thread if it in a cygwin

function, in an exception, spinning, or locked.
* gendef (_sigfe): Move incyg setting earlier.
(sigreturn): Set incyg flag to avoid interrupting called cygwin functions.
(sigdelayed): Ditto.
(stabilize_sig_stack): Ditto.
* sigproc.cc (proc_subproc): Don't restore process lock early in exec case.
* cygtls.h: Reorganize fields in _cygtls slightly.
* tlsoffsets.h: Regenerate.

winsup/cygwin/cygtls.h

@@ -111,9 +111,9 @@ struct _cygtls
   struct _cygtls *prev, *next;
   __stack_t *stackptr;
   int sig;
-  unsigned stacklock;
-  unsigned spinning;
   unsigned incyg;
+  unsigned spinning;
+  unsigned stacklock;
   __stack_t stack[TLS_STACK_SIZE];
   unsigned padding[0];