These comment typos were found in the valgrind fork of libiberty
demangle code.

libiberty/ChangeLog:

	* cplus-dem.c: Change preceeded to preceded.

include/ChangeLog:

	* safe-ctype.h: Change accidently to accidentally.

Investigating GDB PR d/31580 showed that the libiberty demangler
doesn't automatically demangle D mangled names.  However, I think it
should -- like C++ and Rust (new-style), D mangled names are readily
distinguished by the leading "_D", and so the likelihood of confusion
is low.  The other non-"auto" cases in this code are Ada (where the
encoded form could more easily be confused by ordinary programs) and
Java (which is long gone, but which also shared the C++ mangling and
thus was just an output style preference).

This patch also fixed another GDB bug, though of course that part
won't apply to the GCC repository.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31580
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30276

libiberty
	* cplus-dem.c (cplus_demangle): Try the D demangler with
	"auto" format.
	* testsuite/d-demangle-expected: Add --format=auto test.

From-SVN: r279813

	* demangle.h (rust_demangle_callback): Add.

	* cplus-dem.c (cplus_demangle): Use rust_demangle directly.
	(rust_demangle): Remove.
	* rust-demangle.c (is_prefixed_hash): Rename to is_legacy_prefixed_hash.
	(parse_lower_hex_nibble): Rename to decode_lower_hex_nibble.
	(parse_legacy_escape): Rename to decode_legacy_escape.
	(rust_is_mangled): Remove.
	(struct rust_demangler): Add.
	(peek): Add.
	(next): Add.
	(struct rust_mangled_ident): Add.
	(parse_ident): Add.
	(rust_demangle_sym): Remove.
	(print_str): Add.
	(PRINT): Add.
	(print_ident): Add.
	(rust_demangle_callback): Add.
	(struct str_buf): Add.
	(str_buf_reserve): Add.
	(str_buf_append): Add.
	(str_buf_demangle_callback): Add.
	(rust_demangle): Add.
	* rust-demangle.h: Remove.

From-SVN: r278358

include/
	* demangle.h (rust_is_mangled): Move to libiberty/rust-demangle.h.
	(rust_demangle_sym): Move to libiberty/rust-demangle.h.
libiberty/
	* cplus-dem.c: Include rust-demangle.h.
	* rust-demangle.c: Include rust-demangle.h.
	* rust-demangle.h: New file.

From-SVN: r273573