x86: Update cpuid.h to pass leaf to __get_cpuid_max

commit 44cc8e5718efd0cc1ef57c68052dbe33b047f158
Author: Ewan <ewanhai-oc@zhaoxin.com>
Date:   Tue Mar 17 16:12:15 2026 +0800

    i386: Fix __get_cpuid() and __get_cpuid_count() for Centaur/Zhaoxin CPUID ra
nge

caused many regressions, like

FAIL: gcc.dg/vect/vect-100.c scan-tree-dump-not optimized "Invalid sum"

on Linux/x86-64 with -m32.  The commit above changed __get_cpuid_count
which is used by check_vect in tree-vect.h.  When GCC tried to vectorize
check_vect, it outputted

__attribute__((noinline))
void check_vect ()
{
...
;;   Invalid sum of incoming counts 966367640 (estimated locally, freq 0.9000),
should be 719407024 (estimated locally, freq 0.6700)

which failed

/* { dg-final { scan-tree-dump-not "Invalid sum" "optimized" } } */

Change __get_cpuid and __get_cpuid_count to pass the leaf argument
directly to __get_cpuid_max and apply 0xC0000000 mask before passing
it to CPUID.

	PR testsuite/126697
	* config/i386/cpuid.h (__get_cpuid_max): Rename the first
	argument to __leaf and apply 0xC0000000 mask before passing
	it to CPUID.
	(__get_cpuid): Pass __leaf to __get_cpuid_max.
	(__get_cpuid_count): Likewise.

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