gdb: Convert dwarf2_evaluate_property to return bool

gdb: Convert dwarf2_evaluate_property to return bool

Convert dwarf2_evaluate_property to return a bool, there should be no
user visible change after this commit.

gdb/ChangeLog:

	* dwarf2loc.c (dwarf2_evaluate_property): Change return type, and
	update return statements.
	* dwarf2loc.h (dwarf2_evaluate_property): Update return type on
	declaration, and update comment to match.
	* gdbtypes.c (resolve_dynamic_array): Update call to
	dwarf2_evaluate_property to match new return type.