(build_conditional_expr): Use convert (boolean_type_node instead of
truthvalue_conversion.
(build_modify_expr): If the class lacks a constructor or assignment operator,
return error_mark_node.
(common_type): Use build_cplus_array_type.
(commonparms): Don't abort if simple_cst_equal returns < 0.
(build_c_cast): Don't tack on a NON_LVALUE_EXPR when casting to reference type.
(build_indirect_ref): Fix check for *&.

From-SVN: r10037