add noreturn and unreachable

compiler/checker/comptime.odin

@@ -1159,6 +1159,10 @@ ct_eval_expr :: proc(
 			return INVALID_CT_VALUE, ct_flow(.Normal), ct_fail(state, .Not_Comptime, expr.span, "'null' requires an optional context")
 		}
 		return ct_add_value(state, Ct_Value{kind=.Null, type=expected}), ct_flow(.Normal), true
+	case .Unreachable:
+		return INVALID_CT_VALUE, ct_flow(.Normal), ct_fail(
+			state, .Not_Comptime, expr.span, "reached unreachable code during comptime evaluation",
+		)
 	case .Field:
 		if enum_type, enum_ok := enum_type_from_field_expr(checker, expr, state.pkg, state.file); enum_ok {
 			member, ok := find_enum_member(checker, enum_type, expr.name)
@@ -2697,6 +2701,7 @@ ct_typeinfo_value :: proc(state: ^Ct_State, target: types.Type, span: source.Spa
 	tag := "invalid"
 	if !item_ok {
 		if types.is_void(resolved) { tag = "void" }
+		else if types.is_noreturn(resolved) { tag = "noreturn" }
 		else if types.is_anyopaque(resolved) { tag = "anyopaque" }
 		else if types.is_bool(resolved) { tag = "bool" }
 		else if types.is_concrete_integer(resolved) { tag = "integer" }