Fix handling of constructor/destructor of standard substitution:
* 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