Update x86: Call ix86_access_stack_p only for larger alignment

Update x86: Call ix86_access_stack_p only for larger alignment

commit f511bf93f947199a9f9099fee87b7052e5515fb9
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sun Mar 29 14:30:28 2026 -0700

    x86: Call ix86_access_stack_p only for larger alignment

incorrectly uses GET_MODE_ALIGNMENT as memory alignment since memory
alignment can be different from mode alignment as in

(set (reg:OI 20 xmm0 [orig:112 s ] [112])
     (mem/c:OI (plus:DI (reg/f:DI 7 sp)
            (const_int -32 [0xffffffffffffffe0])) [3 s+0 S32 A128]))

MEM_ALIGN should be used instead.

	* config/i386/i386.cc (ix86_need_alignment_p_1): Replace
	GET_MODE_ALIGNMENT with MEM_ALIGN.

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