exact form of the stab
depends on how the parameter is being passed.

   Parameters passed on the stack use the symbol descriptor 'p' and the
'N_PSYM' symbol type (or 'C_PSYM' for XCOFF). The value of the symbol is
an offset used to locate the parameter on the stack; its exact meaning
is machine-dependent, but on most machines it is an offset from the
frame pointer.

   As a simple example, the code:

     main (argc, argv)
          int argc;
          char **argv;

   produces the stabs:

     .stabs "main:F1",36,0,0,_main                 # 36 is N_FUN
     .stabs "argc:p1",160,0,0,68                   # 160 is N_PSYM
     .stabs "argv:p20=*21=*2",160,0,0,72

   The type definition of 'argv' is interesting because it contains
several type definitions.  Type 21 is pointer to type 2 (char) and
'argv' (type 20) is pointer to type 21.

   The following symbol descriptors are also said to go with 'N_PSYM'.
The value of the symbol is said to be an offset from the argument
pointer (I'm not sure whether this is true or not).

     pP (<<??>>)
     pF Fortran function parameter
     X  (function result variable)

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