kbuild: simpler generation of assembly constants

kbuild: simpler generation of assembly constants

gcc doesn't really look inside "asm" statements and more or less
directly emits it into assembly. So pretend "#define" is CPU
instruction.

C++ comment can't be used because sparc assembler doesn't understand it.

Link: http://lkml.kernel.org/r/20160713173646.GA1910@p183.telecom.by
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Michal Marek <mmarek@suse.cz>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>