[patch] Fix var-tracking with dynamic stack realignment on x86

[Eric Botcazou]

> Here is an alternative, almost completely untested, patch, which
> uses DW_OP_fbreg <N> for the arguments of dynamically realigned functions.
> draptest.c now works...

I've attached a slightly revamped, IMO easier to understand version.  Stack 
realignment with DRAP is quite seldom on the mainline (because everything is 
ACCUMULATE_OUTGOING_ARGS now) so I don't think this will make any difference 
in practice.  Tested on i586 and x86-64.


	* var-tracking.c (vt_add_function_parameter): Remap incoming MEMs with
	crtl->args.internal_arg_pointer based address to arg_pointer_rtx if
	there is a DRAP register.
	(vt_init_cfa_base): Don't equate cfa_base_rtx if stack was realigned.
	(vt_initialize): Initialize cfa_base_rtx if there is a DRAP register.


-- 
Eric Botcazou
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