Improve user experience in printing Fortran derived types.

Improve user experience in printing Fortran derived types.

Output for Fortran derived classes is like:

  "( 9, 'abc')"

with this changes the output is changed to:

  "( lucky_number = 9, letters = 'abc')"

2016-06-21  Walfred Tedeschi  <walfred.tedeschi@intel.com>

	* f-valprint.c (f_val_print): Add field names for printing
	derived types fields.

gdb/testsuite:

	* gdb.fortran/derived-type.exp (print q): Add fields to the output.
	* gdb.fortran/vla-type.exp (print twov): Fix vla tests with
	structs.
	* gdb.fortran/derived-type-function.exp: New file.
	* gdb.fortran/derived-type-function.f90: New file.