PR c++/6057
	PR c++/48051
	PR c++/50855
	PR c++/51322
gcc/cp/
	* mangle.c (write_expression): Support NEW_EXPR, DELETE_EXPR,
	THROW_EXPR, CONSTRUCTOR, OVERLOAD.  Fix PREINCREMENT_EXPR and
	PREDECREMENT_EXPR.
	(write_template_arg): Fix mangling of class-scope functions and
	argument packs.
	(mangle_decl): Update suggested -fabi-version argument.
	* operators.def: Add DOTSTAR_EXPR, REINTERPRET_CAST_EXPR,
	DYNAMIC_CAST_EXPR; correct CONST_CAST_EXPR, STATIC_CAST_EXPR.
	* tree.c (dependent_name): No longer static.
	* cp-tree.h: Declare it.
	* pt.c (unify): Defer handling of unconverted functions.
include/
	* demangle.h (enum demangle_component_type): Add
	DEMANGLE_COMPONENT_INITIALIZER_LIST, DEMANGLE_COMPONENT_NULLARY.
libiberty/
	* cp-demangle.c (d_dump): Handle DEMANGLE_COMPONENT_NULLARY and
	DEMANGLE_COMPONENT_INITIALIZER_LIST.
	(d_make_comp): Likewise.  Allow null right arg for
	DEMANGLE_COMPONENT_TRINARY_ARG2.
	(cplus_demangle_operators): Adjust new/delete; add .*, :: and throw.
	(d_template_args, d_template_arg): Handle 'J' for argument packs.
	(d_exprlist): Add terminator parm.
	(d_expression, d_print_comp): Handle initializer lists, nullary
	expressions, prefix/suffix operators, and new.
	(d_print_subexpr): Avoid parens around DEMANGLE_COMPONENT_QUAL_NAME
	and DEMANGLE_COMPONENT_INITIALIZER_LIST.
	* testsuite/demangle-expected: Add tests.

From-SVN: r182970