CallIC customization stubs must accept that a vector slot is cleared.

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index 96ca1ba2d73dadd5d39d827f53757dba58593a73..11b2bbaf9b160a41325b07d6af9df08e9642264f 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -2375,10 +2375,15 @@ void CallIC_ArrayStub::Generate(MacroAssembler* masm) {
   __ j(not_equal, &miss);
 
   __ mov(eax, arg_count());
-  __ mov(ebx, FieldOperand(ebx, edx, times_half_pointer_size,
+  __ mov(ecx, FieldOperand(ebx, edx, times_half_pointer_size,
                            FixedArray::kHeaderSize));
+
   // Verify that ecx contains an AllocationSite
-  __ AssertUndefinedOrAllocationSite(ebx);
+  Factory* factory = masm->isolate()->factory();
+  __ cmp(FieldOperand(ecx, 0), factory->allocation_site_map());

[Toon Verwaest, 2014/07/28 14:11:38]

HeapObject::kMapoffset?

+  __ j(not_equal, &miss);
+
+  __ mov(ebx, ecx);
   ArrayConstructorStub stub(masm->isolate(), arg_count());
   __ TailCallStub(&stub);