[gfortran,patch] Fix intrinsics used as actual arguments

[FX Coudert]

Hi all,

Here is the patch I promised: this fixes a few problems related to  
the use of intrinsics as actual arguments. It's a bit long, but it's  
really straightforward and should be rather easy to review  ;-)

I'll try to comment my patch below, please ask if you have any  
question. First, there are the general front-end changes:

   -- the intrinsics list in intrinsic.c was reviewed and the  
actual_ok field was corrected in each case, according to the  
Standard. A few GNU intrinsics are kept allowed as actual arguments,  
for consistency: ACOSH ATANH DACOSH DASINH DATANH DCONJG DIMAG ZABS  
ZCOS ZEXP ZLOG ZSIN ZSQRT; also, no intrinsic subroutine is allowed  
as actual argument, so having an actual_ok argument to add_sym_?s  
functions is useless; the value of actual_ok is propagated into each  
gfc_intrinsic_sym
   -- create a new function gfc_intrinsic_actual_ok in intrinsic.c  
for the resolution functions to perform checks; it is called in  
resolve_actual_arglist (resolve.c) and an error message is issued if  
need be; the CHAR intrinsic is special-cased because it's the only  
one forbidden (as actual arg) in F95 and allowed in F2003
   -- change gfc_get_extern_function_decl in trans-decl.c to call  
isym->resolve.f3 when an intrinsic has 3 args


Library changes:

   -- make m4 generate new files for AIMAG, ASINH, ACOSH and ATANH  
specifics
  -- use a new simple m4 file (misc_specifics.m4) to generate code  
for other specifics (including character functions)


Smaller changes:

   -- a gfc_resolve_index_func function is added to resolve the INDEX  
intrinsic, so that it can be used as actual argument (PR 16580)
   -- intrinsic.texi is updated to mention that DIMAG is a GNU extension
   -- testcases for all this



Bootstrapped & regtested on i686-linux, OK for 4.2?


:ADDPATCH fortran:
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