Merge a few A64 utils into the CompilerIntrinsics.

src/a64/simulator-a64.cc

Index: src/a64/simulator-a64.cc
diff --git a/src/a64/simulator-a64.cc b/src/a64/simulator-a64.cc
index e0a0d62a02a695128f50cbc2821c2c776e89401e..1c4f4ae7ba4da1c8d42f76c9af0b29459de82e6d 100644
--- a/src/a64/simulator-a64.cc
+++ b/src/a64/simulator-a64.cc
@@ -1615,11 +1615,11 @@ void Simulator::VisitDataProcessing1Source(Instruction* instr) {
     case CLZ_w: set_wreg(dst, CountLeadingZeros(wreg(src), kWRegSize)); break;
     case CLZ_x: set_xreg(dst, CountLeadingZeros(xreg(src), kXRegSize)); break;
     case CLS_w: {
-      set_wreg(dst, CountLeadingSignBits(wreg(src), kWRegSize));
+      set_wreg(dst, CountRedundantLeadingSignBits(wreg(src), kWRegSize));
       break;
     }
     case CLS_x: {
-      set_xreg(dst, CountLeadingSignBits(xreg(src), kXRegSize));
+      set_xreg(dst, CountRedundantLeadingSignBits(xreg(src), kXRegSize));
       break;
     }
     default: UNIMPLEMENTED();