[merge from gcc]

* cp-demangle.c (string_list_def): Add caret_position and comments.
(result_caret_pos): New macro.
(result_append_string): Rename to...
(result_add_string): ... this, and insert at caret position.
Rename throughout.
(result_append): Rename to...
(result_add): ... this, and insert at caret position.  Rename
throughout.
(result_append_char): Rename to...
(result_add_char): ... this, and insert at caret position.  Rename
throughout.
(result_append_space): Remove.
(string_list_new): Initialize caret position.
(result_add_separated_char): Use caret position.
(result_get_caret): New funtion.
(result_set_caret): Likewise.
(result_shift_caret): Likewise.
(result_previous_char_is_space): Likewise.
(substitution_start): Use caret position.
(substitution_add): Likewise.
(demangling_new): Initialize caret position.
(demangle_encoding): Use caret position.
(demanglin_nested_name): Put CV qualifiers after name.
(demangle_type_ptr): Use switch statement.  Handle pointers to
arrays.  Don't use result_append_space.  Use caret position.
(demangle_type): Emit CV qualifiers after underlying type.  Adjust
call to demangle_array_type.
(demangle_array_type): Add parameter to handle pointers to arrays.

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