[patch] add target z80 to gas

[Arnold Metselaar]

Hello,

Here is a a patch and some new files to support the Z80 cpu with 
gas. I volunteer to be the maintainer.

Note that the patch in 
http://sourceware.org/ml/binutils/2005-10/msg00245.html
is needed to make it pass the "macros dot" test.

Kind regards,
Arnold Metselaar

ChangeLog:

* Makefile.am: Add Z80 cpu.
* Makefile.in: Regenerated.
* Makefile: Regenerated.
* app.c (do_scrub_chars)<TC_Z80>: Correctly scrub "ex af,af'" 
and disallow newlines in quoted strings.
* configure.tgt: Add z80-*-coff.
* expr.c (integer_constant)<TC_Z80>: Use 'B' as suffix for 
binary numbers and 'b' for backreferences.
* expr.c (op_encoding)<TC_Z80>: Allow a single '=' as comparison 
operator.
* config/obj-coff.h: Add format "coff-z80".
* doc/Makefile.am: Add c-z80.texi.
* doc/Makefile.in: Regenerated.
* doc/all.texi: Add Z80.
* doc/as.texinfo: Add z80 options and some z80-related remarks.
* testsuite/gas/all/gas.exp: Exclude Z80-*-* from floating 
point, string, and cofftag test.
* testsuite/gas/macros/macros.exp: Expect z80-*-* to fail the 
strings test because it has no string escapes.
* config/tc-z80.c: New file
* config/tc-z80.h: New file
* doc/c-z80.texi: New file
* testsuite/gas/z80/quotes.d: New file
* testsuite/gas/z80/quotes.s: New file
* testsuite/gas/z80/redef.d: New file
* testsuite/gas/z80/redef.s: New file
* testsuite/gas/z80/z80.exp: New file

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