Use register parameters in ElementsTransitionGenerator.

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 7a27776a5e04dfeaa5767ba8d90b9f34cbaf8c35..13fc01f5f47f3fb75a357a384fd79df3706797fe 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -50,7 +50,16 @@ class SmiOperationExecutionMode : public EnumSet<SmiOperationConstraint, byte> {
       : EnumSet<SmiOperationConstraint, byte>(bits) { }
 };
 
-bool AreAliased(Register r1, Register r2, Register r3, Register r4);
+#ifdef DEBUG
+bool AreAliased(Register reg1,
+                Register reg2,
+                Register reg3 = no_reg,
+                Register reg4 = no_reg,
+                Register reg5 = no_reg,
+                Register reg6 = no_reg,
+                Register reg7 = no_reg,
+                Register reg8 = no_reg);
+#endif
 
 // Forward declaration.
 class JumpTarget;