[Patch, Fortran] PR57508 - Fix ICE/Reject-valid issue with get_temp_from_expr (intrinsic assignment with defined assignment)

[Tobias Burnus]

Dear all,

Due to copying the attributes, the temporary variable could get marked 
as function (attr.function, attr.flavor == FL_PROCEDURE). This either 
lead to leaking those attributes into the assembler file - or to cause 
an error due to the call to gfc_add_flavor. With this patch, I now 
explicitly unset those attribues.  (Fund when building ForTrilinos.)

Build and
OK for the trunk and GCC 4.8?

Tobias
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