DeadCode: Update rule metadata.

Author: lcartey

cpp/common/src/codingstandards/cpp/exclusions/c/RuleMetadata.qll

@@ -12,6 +12,7 @@ import Contracts1
 import Contracts2
 import Contracts3
 import Contracts4
+import DeadCode
 import Declarations1
 import Declarations2
 import Declarations3
@@ -50,6 +51,7 @@ newtype TCQuery =
   TContracts2PackageQuery(Contracts2Query q) or
   TContracts3PackageQuery(Contracts3Query q) or
   TContracts4PackageQuery(Contracts4Query q) or
+  TDeadCodePackageQuery(DeadCodeQuery q) or
   TDeclarations1PackageQuery(Declarations1Query q) or
   TDeclarations2PackageQuery(Declarations2Query q) or
   TDeclarations3PackageQuery(Declarations3Query q) or
@@ -88,6 +90,7 @@ predicate isQueryMetadata(Query query, string queryId, string ruleId, string cat
   isContracts2QueryMetadata(query, queryId, ruleId, category) or
   isContracts3QueryMetadata(query, queryId, ruleId, category) or
   isContracts4QueryMetadata(query, queryId, ruleId, category) or
+  isDeadCodeQueryMetadata(query, queryId, ruleId, category) or
   isDeclarations1QueryMetadata(query, queryId, ruleId, category) or
   isDeclarations2QueryMetadata(query, queryId, ruleId, category) or
   isDeclarations3QueryMetadata(query, queryId, ruleId, category) or