Do not clobber sp in _hurd_stack_setup

[Joseph Myers]

GCC mainline now gives errors for an asm that clobbers the stack
pointer.  According to
<https://gcc.gnu.org/ml/gcc-patches/2018-12/msg00932.html> GCC
previously ignored such a clobber; thus, this patch removes it from
_hurd_stack_setup.

Tested with build-many-glibcs.py for i686-gnu.

2018-12-13  Joseph Myers  <joseph@codesourcery.com>

	* sysdeps/mach/hurd/i386/init-first.c (_hurd_stack_setup): Do not
	clobber sp.

diff --git a/sysdeps/mach/hurd/i386/init-first.c b/sysdeps/mach/hurd/i386/init-first.c
index f8ad2ceb8e..e3d5797266 100644
--- a/sysdeps/mach/hurd/i386/init-first.c
+++ b/sysdeps/mach/hurd/i386/init-first.c
@@ -361,7 +361,7 @@ _hurd_stack_setup (void)
       *--data = caller;
       asm volatile ("movl %0, %%esp\n" /* Switch to new outermost stack.  */
 		    "movl $0, %%ebp\n" /* Clear outermost frame pointer.  */
-		    "jmp *%1" : : "r" (data), "r" (&doinit1) : "sp");
+		    "jmp *%1" : : "r" (data), "r" (&doinit1));
       /* NOTREACHED */
     }
 

-- 
Joseph S. Myers
joseph@codesourcery.com