[PATCH] [2nd try] Show AIX gc'd symbol address adjustments in map file

[Douglas B Rupp]

Please ignore my 1st try with the wrong email address for Richard Sandiford

Greetings,

I seek feedback on the attached patch, which enhances the .map file to 
show better address info on AIX XCOFF garbage collected symbols.

--Douglas Rupp, AdaCore

===============

The current .map file output with -nogc is something like this:

  .pr            0x100012b0       0x20 ./pack1.o
                 0x100012b0                .pack1__fooIP
                 0x100012c0                .pack1__bumIP
  .pr            0x100012d0       0x60 ./test1.o

----------

The current .map file output with -gc (the default) is something like this:

  .pr            0x100012b0        0x0 ./pack1.o
                 0x100012b0                .pack1__fooIP
                 0x100012c0                .pack1__bumIP
  .pr            0x100012b0       0x60 ./test1.o

Note that .pack1__fooIP and .pack1__bumIP have been gc'd and the 
addresses make no sense.

------------

The output with the attached patch is something like this:

  .pr            0x100012b0        0x0 ./pack1.o
                 0x100012b0          -->gc 0x100012b0 .pack1__fooIP
                 0x100012c0          -->gc 0x100012b0 .pack1__bumIP
  .pr            0x100012b0       0x60 ./test1.o

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