[RFA/x86_64] Add handling for TYPE_CODE_CHAR in inferior fun calls

[Joel Brobecker <brobecker at adacore dot com>]

Hello,

There was on ommision inside amd64-tdep.c:amd64_classify regarding
the handling of TYPE_CODE_CHAR types.  This shows up when printing
the return value after making a function call inside the inferior.
This shows up inside gdb.ada/char_param.exp:

    FAIL: gdb.ada/char_param.exp: call next

Here is what the logs show:

    (gdb) call next (first)
    $3 = 0 '["00"]'

The expected output is:

    (gdb) call next (first)
    $3 = 98 'b'

The following patch fixes that ommission:

2007-12-26  Joel Brobecker  <brobecker@adacore.com>

        * amd64-tdep.c (amd64_classify): Add handling of TYPE_CODE_CHAR.

Tested on x86_64-linux, fixes the FAIL above. No regression.
OK to commit?

Thanks,
-- 
Joel

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