test/Makefile: add rule to produce a .dbg file
test/Makefile: add rule to produce a .dbg file

Add a rule to produce a .dbg file, that is, a dump of all the calls to
the back end.

Signed-off-by: H. Peter Anvin <8a453bad9912ffe59bc0f0b8abe03df9be19379e@zytor.com>

turingstudio/nasm,projedi/nasm,techkey/nasm,Distrotech/nasm,turingstudio/nasm,Distrotech/nasm,projedi/nasm,letolabs/nasm,projedi/nasm,techkey/nasm,techkey/nasm,projedi/nasm,turingstudio/nasm,techkey/nasm,letolabs/nasm,letolabs/nasm,turingstudio/nasm,Distrotech/nasm,projedi/nasm,techkey/nasm,Distrotech/nasm