gdb: Convert la_struct_too_deep_ellipsis to a method

Convert language_data::la_struct_too_deep_ellipsis member variable to
a method in language_defn.

There should be no user visible changes after this commit.

gdb/ChangeLog:

	* ada-lang.c (ada_language_data): Remove
	la_struct_too_deep_ellipsis initializer.
	(ada_language::struct_too_deep_ellipsis): New member function.
	* c-lang.c (c_language_data): Remove la_struct_too_deep_ellipsis
	initializer.
	(cplus_language_data): Likewise.
	(asm_language_data): Likewise.
	(minimal_language_data): Likewise.
	* cp-valprint.c (cp_print_value): Update call to
	struct_too_deep_ellipsis.
	* d-lang.c (d_language_data): Remove la_struct_too_deep_ellipsis
	initializer.
	* f-lang.c (f_language_data): Likewise.
	(f_language::struct_too_deep_ellipsis): New member function.
	* go-lang.c (go_language_data): Remove la_struct_too_deep_ellipsis
	initializer.
	* language.c (unknown_language_data): Likewise.
	(auto_language_data): Likewise.
	* language.h (language_data): Delete la_struct_too_deep_ellipsis
	member variable.
	(language_defn::struct_too_deep_ellipsis): New member function.
	* m2-lang.c (m2_language_data): Remove la_struct_too_deep_ellipsis
	initializer.Q
	* objc-lang.c (objc_language_data): Likewise.
	* opencl-lang.c (opencl_language_data): Likewise.
	* p-lang.c (pascal_language_data): Likewise.
	* rust-lang.c (rust_language_data): Likewise.
	* valprint.c (val_print_check_max_depth): Update call to
	struct_too_deep_ellipsis.

gdb/opencl-lang.c

@@ -1021,7 +1021,6 @@ extern const struct language_data opencl_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &default_varobj_ops,
-  "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
 /* Class representing the OpenCL language.  */