From Elena Zannoni <ezannoni@redhat.com>. Test e500 abi and
vector registes.
* gdb.arch/e500-regs.c, gdb.arch/e500-regs.exp: New files.
* gdb.arch/e500-abi.c, gdb.arch/e500-abi.exp: New files.
(subdirs, clean, distclean): Use it.
* gdb.arch/Makefile.in: Clean up Makefile. Remove rules for
regenerating Makefile, since it is generated from the top level.
* gdb.asm/Makefile.in: Likewise.
* gdb.base/Makefile.in: Likewise.
* gdb.c++/Makefile.in: Likewise.
* gdb.disasm/Makefile.in: Likewise.
* gdb.java/Makefile.in: Likewise.
* gdb.mi/Makefile.in: Likewise.
* gdb.threads/Makefile.in: Likewise.
* gdb.trace/Makefile.in: Likewise.