Use countPopulation

add include

Author: Azoy

include/swift/ABI/GenericContext.h

@@ -18,6 +18,7 @@
 #ifndef SWIFT_ABI_GENERICCONTEXT_H
 #define SWIFT_ABI_GENERICCONTEXT_H
 
+#include "llvm/Support/MathExtras.h"
 #include "swift/ABI/TargetLayout.h"
 #include "swift/ABI/MetadataValues.h"
 #include "swift/ABI/MetadataRef.h"
@@ -696,7 +697,7 @@ class TrailingGenericContextObjects<TargetSelf<Runtime>,
     if (!asSelf()->hasConditionalInvertedProtocols())
       return 0;
 
-    return __builtin_popcount(getConditionalInvertedProtocols().rawBits());
+    return countPopulation(getConditionalInvertedProtocols().rawBits());
   }
 
   size_t numTrailingObjects(