valops.c: Some more gdb::array_view

This commit replaces some more use of pointer+length pairs in the
overload resolution code with gdb::array_view.

find_oload_champ's interface is simplified/normalized: the xmethods
parameter is converted from std::vector to array pointer, and then the
num_fns parameter is always passed in, no matter the array which is
non-NULL.  I tweaked the formatting of callers a little bit here and
there so that the 3 optional parameters are all in the same line.  (I
tried making the 3 optional array parameters be array_views, but the
resulting code didn't look as nice.)

gdb/ChangeLog:
2018-11-21  Pedro Alves  <palves@redhat.com>

	* valops.c (find_method_list): Replace pointer and length
	parameters with an gdb::array_view.  Adjust.
	(value_find_oload_method_list): Likewise.
	(find_overload_match): Use gdb::array_view for methods list.
	Adjust to find_oload_champ interface change.
	(find_oload_champ): 'xm_worker_vec' parameter now a pointer/array.
	'num_fns' parameter now a size_t.  Eliminate 'fn_count' local.

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