mips: do not save variables in "hi" or "lo" across system calls

The kernel does not save these registers across system calls.  GCC 4.4
has gotten more aggressive about using them for temporary variables, so
this shows up as intermittent crashes if you use a recent compiler.

Signed-off-by: Daniel Jacobowitz <dan@codesourcery.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

libc/sysdeps/linux/mips/bits/syscalls.h

@@ -261,7 +261,7 @@
 })
 
 #define __SYSCALL_CLOBBERS "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", \
-	"$14", "$15", "$24", "$25", "memory"
+	"$14", "$15", "$24", "$25", "hi", "lo", "memory"
 
 #else /* N32 || N64 */
 
@@ -318,7 +318,7 @@
 })
 
 #define __SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13", \
-	"$14", "$15", "$24", "$25", "memory"
+	"$14", "$15", "$24", "$25", "hi", "lo", "memory"
 
 #endif