[PATCH,Fortran] Allow pointer initialization in DATA

[Steve Kargl]

The attach patch allows for pointer initialization in
a DATA statement per F2018.  Yes, it's weird that a
data-constant-object is not a named parameter.  The
'data-constant-object' is required to have the SAVE and
TARGET attribute.

Built and regression tested on x86_64-*-freebsd.
OK to commit?

PS: I'm sure Gerhard can break this.

2018-05-24  Steven G. Kargl  <kargl@gcc.gnu.org>

	* decl.c (match_data_constant):  Fortran 2018 allows pointer
	initialization in a data statement.

2018-05-24  Steven G. Kargl  <kargl@gcc.gnu.org>

	* gfortran.dg/data_stmt_pointer.f90: new test.

-- 
Steve
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