Limited success with 3.0 branch on AIX

[David Edelsohn]

	The AIX stab-like choices are:

#define C_GSYM          0x80
#define C_LSYM          0x81
#define C_PSYM          0x82
#define C_RSYM          0x83
#define C_RPSYM         0x84
#define C_STSYM         0x85
#define C_TCSYM         0x86
#define C_BCOMM         0x87
#define C_ECOML         0x88
#define C_ECOMM         0x89
#define C_DECL          0x8c
#define C_ENTRY         0x8d
#define C_FUN           0x8e
#define C_BSTAT         0x8f
#define C_ESTAT         0x90

	C_GSYM seemed to make the most sense to me.  Would gdb looking in
N_GSYM cause a problem for any other ports?  Should gdb look there only
for AIX?

	Would N_GSYM symbol cause a conflict if a programmer really chose
to declare a global symbol named "gcc2_compiled."?  Given the definition
of N_GSYM, it seems that this only would define a duplicate stabs entry
and not conflict with a real symbol of that same name because the stabs
value is ignored.

	I would like to get a patch into GCC ASAP, but I want it to match
what GDB expects / can handle.  So I would like to get a decision to use
G_NSYM or an alternate AIX stabs type, and get the simple changes into GCC
and GDB.

Thanks, David