Fix build of ppc64 target.

Fix build of ppc64 target.

Since a889e06ac68 the following fails.

In file included from ../../gcc/tree-ssa-propagate.h:25:0,
                 from ../../gcc/config/rs6000/rs6000.c:78:
../../gcc/value-query.h:90:31: error: ‘irange’ has not been declared
   virtual bool range_of_expr (irange &r, tree name, gimple * = NULL) = 0;
                               ^~~~~~
../../gcc/value-query.h:91:31: error: ‘irange’ has not been declared
   virtual bool range_on_edge (irange &r, edge, tree name);
                               ^~~~~~
../../gcc/value-query.h:92:31: error: ‘irange’ has not been declared
   virtual bool range_of_stmt (irange &r, gimple *, tree name = NULL);
                               ^~~~~~
In file included from ../../gcc/tree-ssa-propagate.h:25:0,
                 from ../../gcc/config/rs6000/rs6000-call.c:67:
../../gcc/value-query.h:90:31: error: ‘irange’ has not been declared
   virtual bool range_of_expr (irange &r, tree name, gimple * = NULL) = 0;
                               ^~~~~~
../../gcc/value-query.h:91:31: error: ‘irange’ has not been declared
   virtual bool range_on_edge (irange &r, edge, tree name);
                               ^~~~~~
../../gcc/value-query.h:92:31: error: ‘irange’ has not been declared
   virtual bool range_of_stmt (irange &r, gimple *, tree name = NULL);

gcc/ChangeLog:

	* config/rs6000/rs6000-call.c: Include value-range.h.
	* config/rs6000/rs6000.c: Likewise.