PPC64: Implemented the Word64Popcnt TurboFan operator.

src/ppc/assembler-ppc.cc

Index: src/ppc/assembler-ppc.cc
diff --git a/src/ppc/assembler-ppc.cc b/src/ppc/assembler-ppc.cc
index 5021b387913034bd22aff8b72d978fe5f87ee7a1..e2d258d61d845af63ff52833ce7c9a144ebb751e 100644
--- a/src/ppc/assembler-ppc.cc
+++ b/src/ppc/assembler-ppc.cc
@@ -1476,6 +1476,11 @@ void Assembler::cntlzd_(Register ra, Register rs, RCBit rc) {
 }
 
 
+void Assembler::popcntd(Register ra, Register rs) {
+  emit(EXT2 | POPCNTD | rs.code() * B21 | ra.code() * B16);
+}
+
+
 void Assembler::mulld(Register dst, Register src1, Register src2, OEBit o,
                       RCBit r) {
   xo_form(EXT2 | MULLD, dst, src1, src2, o, r);