[IA64] entry.S: Align rse_clear_invalid to double-bundle boundary.

Trivial patch: align rse_clear_invalid to 32-byte boundary.  Good for
a 9 cycle speed up.
Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/entry.S

@@ -971,6 +971,7 @@ dont_preserve_current_frame:
 	shladd in0=loc1,3,r17
 	mov in1=0
 	;;
+	.align 32
 rse_clear_invalid:
 #ifdef CONFIG_ITANIUM
 	// cycle 0