x86: add <asm/asm.h>

Create <asm/asm.h>, with common definitions suitable for assembly
unification.
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

include/asm-x86/asm.h

+#ifndef _ASM_X86_ASM_H
+#define _ASM_X86_ASM_H
+
+#ifdef CONFIG_X86_32
+/* 32 bits */
+
+# define _ASM_PTR	" .long "
+# define _ASM_ALIGN	" .balign 4 "
+
+#else
+/* 64 bits */
+
+# define _ASM_PTR	" .quad "
+# define _ASM_ALIGN	" .balign 8 "
+
+#endif /* CONFIG_X86_32 */
+
+#endif /* _ASM_X86_ASM_H */