* dcrt0.cc (wow64_respawn): New static variable.

	* dcrt0.cc (wow64_respawn): New static variable.
	(wow64_started_from_native64): New function to check if a WOW64
	process got started from a native 64 bit process.
	(respawn_wow64_process): New function to respawn process.
	(dll_crt0_0): When started from a native parent, check if parent
	is a 64 bit process.  If so, return early.
	(_dll_crt0): Respawn WOW64 process here if required.
	* init.cc (respawn_wow64_process): Remove.
	(dll_entry): Rename wow64_test_stack_marker to test_stack_marker.
	Drop WOW64 test here.