ARM: Reduce amount of code generated for LoadIC_Megamorphic....

src/x64/stub-cache-x64.cc

Index: src/x64/stub-cache-x64.cc
===================================================================
--- src/x64/stub-cache-x64.cc	(revision 8654)
+++ src/x64/stub-cache-x64.cc	(working copy)
@@ -140,11 +140,13 @@
                               Register name,
                               Register scratch,
                               Register extra,
-                              Register extra2) {
+                              Register extra2,
+                              Register extra3) {
   Isolate* isolate = masm->isolate();
   Label miss;
   USE(extra);   // The register extra is not used on the X64 platform.
   USE(extra2);  // The register extra2 is not used on the X64 platform.
+  USE(extra3);  // The register extra3 is not used on the X64 platform.
   // Make sure that code is valid. The shifting code relies on the
   // entry size being 16.
   ASSERT(sizeof(Entry) == 16);
@@ -156,9 +158,10 @@
   ASSERT(!scratch.is(receiver));
   ASSERT(!scratch.is(name));
 
-  // Check scratch register is valid, extra and extra2 are unused.
+  // Check scratch register is valid, extra, extra2 and extra3 are unused.
   ASSERT(!scratch.is(no_reg));
   ASSERT(extra2.is(no_reg));
+  ASSERT(extra3.is(no_reg));
 
   // Check that the receiver isn't a smi.
   __ JumpIfSmi(receiver, &miss);