[IA64] entry.S: .align in .text sections is broken, use TEXT_ALIGN()

A few reports of illegal instruction panics while trying to boot
were tracked to this.  Fix by David Mosberger.
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/entry.S

@@ -987,7 +987,7 @@ dont_preserve_current_frame:
 	shladd in0=loc1,3,r17
 	mov in1=0
 	;;
-	.align 32
+	TEXT_ALIGN(32)
 rse_clear_invalid:
 #ifdef CONFIG_ITANIUM
 	// cycle 0