X64: Convert doubles to int32 inline (without calling runtime).

src/x64/assembler-x64.h

Index: src/x64/assembler-x64.h
diff --git a/src/x64/assembler-x64.h b/src/x64/assembler-x64.h
index e17a55d828c3ed79e1f1fcd0eb676492e66f48d4..766c5d11055e0106835ae5bf16ff89e5aecfdc80 100644
--- a/src/x64/assembler-x64.h
+++ b/src/x64/assembler-x64.h
@@ -679,6 +679,10 @@ class Assembler : public Malloced {
     arithmetic_op(0x23, dst, src);
   }
 
+  void andl(Register dst, Register src) {
+    arithmetic_op_32(0x23, dst, src);
+  }
+
   void and_(Register dst, const Operand& src) {
     arithmetic_op(0x23, dst, src);
   }