* cp-demangle.c (struct d_standard_sub_info): Define.
	(d_substitution): Add prefix argument.  Change all callers.
	Rework handling of standard substitutions to print full name when
	qualifying a constructor/destructor, or when DMGL_VERBOSE is set.
	* testsuite/demangle-expected: Add test case.

	Fix handling of negative literal constants:
	* cp-demangle.c (enum d_comp_type): Add D_COMP_LITERAL_NEG.
	(d_dump, d_make_comp): Handle D_COMP_LITERAL_NEG.
	(d_expr_primary): Use D_COMP_LITERAL_NEG for a negative number.
	(d_print_comp): Handle D_COMP_LITERAL_NEG.
	* testsuite/demangle-expected: Add test case.

From-SVN: r74632