riscv: s64ilp32: Temporary workaround solution to gcc problem

There is an existing problem in 64ilp32 gcc that combines two pointers
in one register. Liao is solving that problem. Before he finishes the
job, we could prevent it with a simple noinline attribute, fortunately.

struct path {
	struct vfsmount *mnt;
	struct dentry *dentry;
} __randomize_layout;

struct nameidata {
        struct path     path;
        struct qstr     last;
        struct path     root;
...
} __randomize_layout;

	struct nameidata *nd
	...
	nd->path = nd->root;
6c88                	ld	a0,24(s1)
				^^ // Wrong arg of mntget
e088                	sd	a0,0(s1)
	// Need inserting "lw a0,0(s1)" here
	mntget(path->mnt);
2a6150ef          	jal	c01ce946 <mntget>

Any gcc helps are welcome :)

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Cc: LiaoShihua <shihua@iscas.ac.cn>