x86: Call ix86_access_stack_p only with symbolic constant load

x86: Call ix86_access_stack_p only with symbolic constant load

ix86_access_stack_p can be quite expensive.  Cache the result and call it
only if there are symbolic constant loads.  This reduces the compile time
of PR target/124165 test from 202 seconds to 55 seconds.

gcc/

	PR target/124165
	* config/i386/i386-protos.h (symbolic_reference_mentioned_p):
	Change the argument type from rtx to const_rtx.
	* config/i386/i386.cc (symbolic_reference_mentioned_p): Likewise.
	(ix86_access_stack_p): Add 2 auto_bitmap[] arguments.  Cache
	the register BB domination result.
	(ix86_symbolic_const_load_p_1): New.
	(ix86_symbolic_const_load_p): Likewise.
	(ix86_find_max_used_stack_alignment): If there is no symbolic
	constant load into the register, don't call ix86_access_stack_p.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>