src/cpu/aarch64/vm/vm_version_aarch64.cpp

rev 8532 : 8129426: aarch64: add support for PopCount in C2
Summary: Add support for PopCount using SIMD cnt and addv inst
Reviewed-by: duke
Contributed-by: alexander.alexeev@caviumnetworks.com

@@ -249,10 +249,14 @@
 
   if (FLAG_IS_DEFAULT(UseBarriersForVolatile)) {
     UseBarriersForVolatile = (_cpuFeatures & CPU_DMB_ATOMICS) != 0;
   }
 
+  if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
+    UsePopCountInstruction = true;
+  }
+
 #ifdef COMPILER2
   if (FLAG_IS_DEFAULT(OptoScheduling)) {
     OptoScheduling = true;
   }
 #endif