* gendef (_sigfe): Save float arguments as well before calling yield.
	(_sigbe): Move saving %rax from prologue to just before the yield call.
	Save %xmm0 register, too.
	(sigdelayed): Add comment.  Save %xmm0 register, too, before calling
	yield.
	* autoload.cc (.#dllname_info): Call _std_dll_init on x86_64 bit, too.
	(INIT_WRAPPER): Change to accommodate the change of the init functions
	from sysv_abit to ms_abi.  Fix preceeding comment accordingly.  Add
	SEH information and comments.
	(std_dll_init): Drop leading underscore on x86_64.  Drop sysv_abi
	comment.
	(wsock_init): Ditto.
	(LoadDLLprime): Drop surrounding ifdef to accommodate above underscore
	juggling.
Pull in changes from HEAD
	* gendef (_sigfe): 16-byte align xmm0 storage and use movdqa.
	(_sigbe): Fix alignment before calling yield.  Use movdqa to save and
	restore xmm0.
	(sigdelayed): Use movdqa to save and restore xmm0.
	(_ZN7_cygtls4lockEv): Change absolute values to hex.
	(stabilize_sig_stack): Ditto.
	(setjmp): Add comment to explain usage of movdqu.
	(__sjfault): Ditto.
	(__ljfault): Ditto.
	(longjmp): Ditto. Access return value using 32 bit opcodes only.
	* miscfuncs.cc (thread_wrapper): Don't attempt to copy exception
	handler list on x86_64.
	* dcrt0.cc (child_info_fork::handle_fork): Call
	_pei386_runtime_relocator first thing, before copying parent data and
	bss segment.  Tweak comment to explain why.
	* cygtls.h (CYGTLS_PADSIZE): Reduce to 8000 on x86_64.
	* tlsoffsets64.h: Regenerate.
	* Revert previous patch.  For some reason perl doesn't like it.
Merge branch 'cygwin64' into msys2-64-dev