* cp-name-parser.y (struct demangle_info): Remove unused
member PREV.
(d_grab): Likewise.
(allocate_info): Change return type to struct demangle_info *.
Always allocate a new demangle_info.
Remove unused PREV pointer.
(cp_new_demangle_parse_info): New function.
(cp_demangled_name_parse_free): New function.
(do_demangled_name_parse_free_cleanup): New function.
(make_cleanup_cp_demangled_name_parse_free): New function.
(cp_demangled_name_to_comp): Change return type to
struct demangle_parse_info *.
Allocate a new storage for each call.
(main): Update usage for cp_demangled_name_to_comp
API change.
* cp-support.h (struct demangle_parse_info): New structure.
(cp_demangled_name_to_comp): Update API change for
return type.
(cp_new_demangle_parse_info): Declare.
(make_cleanup_cp_demangled_name_parse_free): New declaration.
(cp_demangled_name_parse_free): Declare.
* cp-support.c (cp_canonicalize_string): Update API
change for cp_demangled_name_to_comp.
(mangled_name_to_comp): Likewise.
Return struct demangle_parse_info, too.
(cp_class_name_from_physname): Update mangled_name_to_comp
API change.
(method_name_from_physname): Likewise.
(cp_func_name): Update API change for cp_demangled_name_to_comp.
(cp_remove_params): Likewise.
* python/py-type.c (typy_legacy_template_argument): Likewise.
* cp-support.h (cp_canonicalize_string_no_typedefs): Declare.
(cp_merge_demangle_parse_infos): Declare.
* cp-support.c (ignore_typedefs): New file global.
(copy_string_to_obstack): New function.
(inspect_type): New function.
(replace_typedefs): New function.
(replace_typedefs_qualified_name): New function.
(cp_canonicalize_string_no_typedefs): New function.
* cp-name-parser.y (cp_merge_demangle_parse_infos): New function.
(cp_new_demangle__parse_info): Allocate and initialize the obstack.
* linespec.c (find_methods): Use cp_canonicalize_string_no_typedefs
instead of cp_canonicalize_string.
(find_method): Likewise.
(decode_compound): Before looking up the name, call
cp_canonicalize_string_no_typedefs.
(decode_variable): Likewise.
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