cmPolicies: Store only state that users can set.

cmPolicies::PolicyMap does not need to store the REQUIRED_ALWAYS or
REQUIRED_IF_USED states as they are statically determined.

Source/cmPolicies.cxx

@@ -356,14 +356,6 @@ cmPolicies::PolicyMap::Get(cmPolicies::PolicyID id) const
     {
     status = cmPolicies::NEW;
     }
-  else if (this->Status[(POLICY_STATUS_COUNT * id) + REQUIRED_ALWAYS])
-    {
-    status = cmPolicies::REQUIRED_ALWAYS;
-    }
-  else if (this->Status[(POLICY_STATUS_COUNT * id) + REQUIRED_IF_USED])
-    {
-    status = cmPolicies::REQUIRED_IF_USED;
-    }
   return status;
 }
 
@@ -373,19 +365,13 @@ void cmPolicies::PolicyMap::Set(cmPolicies::PolicyID id,
   this->Status[(POLICY_STATUS_COUNT * id) + OLD] = (status == OLD);
   this->Status[(POLICY_STATUS_COUNT * id) + WARN] = (status == WARN);
   this->Status[(POLICY_STATUS_COUNT * id) + NEW] = (status == NEW);
-  this->Status[(POLICY_STATUS_COUNT * id) + REQUIRED_ALWAYS] =
-      (status == REQUIRED_ALWAYS);
-  this->Status[(POLICY_STATUS_COUNT * id) + REQUIRED_IF_USED] =
-      (status == REQUIRED_IF_USED);
 }
 
 bool cmPolicies::PolicyMap::IsDefined(cmPolicies::PolicyID id) const
 {
   return this->Status[(POLICY_STATUS_COUNT * id) + OLD]
       || this->Status[(POLICY_STATUS_COUNT * id) + WARN]
-      || this->Status[(POLICY_STATUS_COUNT * id) + NEW]
-      || this->Status[(POLICY_STATUS_COUNT * id) + REQUIRED_ALWAYS]
-      || this->Status[(POLICY_STATUS_COUNT * id) + REQUIRED_IF_USED];
+      || this->Status[(POLICY_STATUS_COUNT * id) + NEW];
 }
 
 bool cmPolicies::PolicyMap::IsEmpty() const

Source/cmPolicies.h

@@ -244,7 +244,6 @@ public:
     REQUIRED_IF_USED,
     REQUIRED_ALWAYS ///< Issue an error unless user sets policy status to NEW.
   };
-#define POLICY_STATUS_COUNT 5
 
   /// Policy identifiers
   enum PolicyID
@@ -288,6 +287,7 @@ public:
     bool IsEmpty() const;
 
   private:
+#define POLICY_STATUS_COUNT 3
     std::bitset<cmPolicies::CMPCOUNT * POLICY_STATUS_COUNT> Status;
   };
 };