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

src/arm/code-stubs-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 2948 matching lines @@
   ParameterCount actual(argc);
 
   EmitLoadTypeFeedbackVector(masm, r2);
 
   __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, r4);
   __ cmp(r1, r4);
   __ b(ne, &miss);
 
   __ mov(r0, Operand(arg_count()));
   __ add(r4, r2, Operand::PointerOffsetFromSmiKey(r3));
-  __ ldr(r2, FieldMemOperand(r4, FixedArray::kHeaderSize));
-  // Verify that r2 contains an AllocationSite
-  __ AssertUndefinedOrAllocationSite(r2, r4);
+  __ ldr(r4, FieldMemOperand(r4, FixedArray::kHeaderSize));
+
+  // Verify that r4 contains an AllocationSite
+  __ ldr(r5, FieldMemOperand(r4, HeapObject::kMapOffset));
+  __ CompareRoot(r5, Heap::kAllocationSiteMapRootIndex);
+  __ b(ne, &miss);
+
+  __ mov(r2, r4);
   ArrayConstructorStub stub(masm->isolate(), arg_count());
   __ TailCallStub(&stub);
 
   __ bind(&miss);
   GenerateMiss(masm, IC::kCallIC_Customization_Miss);
 
   // The slow case, we need this no matter what to complete a call after a miss.
   CallFunctionNoFeedback(masm,
                          arg_count(),
                          true,
@@ skipping 46 matching lines @@
 
   __ bind(&extra_checks_or_miss);
   Label miss;
 
   __ CompareRoot(r4, Heap::kMegamorphicSymbolRootIndex);
   __ b(eq, &slow_start);
   __ CompareRoot(r4, Heap::kUninitializedSymbolRootIndex);
   __ b(eq, &miss);
 
   if (!FLAG_trace_ic) {
-    // We are going megamorphic, and we don't want to visit the runtime.
+    // We are going megamorphic. If the feedback is a JSFunction, it is fine
+    // to handle it here. More complex cases are dealt with in the runtime.
+    __ AssertNotSmi(r4);
+    __ CompareObjectType(r4, r5, r5, JS_FUNCTION_TYPE);
+    __ b(ne, &miss);
     __ add(r4, r2, Operand::PointerOffsetFromSmiKey(r3));
     __ LoadRoot(ip, Heap::kMegamorphicSymbolRootIndex);
     __ str(ip, FieldMemOperand(r4, FixedArray::kHeaderSize));
     __ jmp(&slow_start);
   }
 
   // We are here because tracing is on or we are going monomorphic.
   __ bind(&miss);
   GenerateMiss(masm, IC::kCallIC_Miss);
 
@@ skipping 2015 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM