[Patch,Fortran] PR 45756 Fix muliple-decl issue with PARAMETER

[Tobias Burnus]

  For PARAMETERs in MODULEs which are of derived type or array-valued 
gfortran creates a static variable. This patch ensures that no extra 
declaration is generated for use associated parameters.

If one runs the testcase (see PR) without patch, the result of 
-fdump-tree-original-uid is:

   iD.1554 = paraD.1556[0];
   jD.1559 = paraD.1561[0];

with the patch, the result is:
   iD.1513 = paraD.1510[0];
   jD.1516 = paraD.1510[0];


Build on x86-64-linux and currently regtesting; if it succeeds:
OK for the trunk?

Tobias

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