vector-based ICs did not update type feedback counts correctly.

src/arm/full-codegen-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/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 1176 matching lines @@
   __ bind(&no_descriptors);
   __ Drop(1);
   __ jmp(&exit);
 
   // We got a fixed array in register r0. Iterate through that.
   Label non_proxy;
   __ bind(&fixed_array);
 
   __ Move(r1, FeedbackVector());
   __ mov(r2, Operand(TypeFeedbackVector::MegamorphicSentinel(isolate())));
-  __ str(r2, FieldMemOperand(r1, FixedArray::OffsetOfElementAt(slot.ToInt())));
+  int vector_index = FeedbackVector()->GetIndex(slot);
+  __ str(r2, FieldMemOperand(r1, FixedArray::OffsetOfElementAt(vector_index)));
 
   __ mov(r1, Operand(Smi::FromInt(1)));  // Smi indicates slow check
   __ ldr(r2, MemOperand(sp, 0 * kPointerSize));  // Get enumerated object
   STATIC_ASSERT(FIRST_JS_PROXY_TYPE == FIRST_SPEC_OBJECT_TYPE);
   __ CompareObjectType(r2, r3, r3, LAST_JS_PROXY_TYPE);
   __ b(gt, &non_proxy);
   __ mov(r1, Operand(Smi::FromInt(0)));  // Zero indicates proxy
   __ bind(&non_proxy);
   __ Push(r1, r0);  // Smi and array
   __ ldr(r1, FieldMemOperand(r0, FixedArray::kLengthOffset));
@@ skipping 1683 matching lines @@
       VisitForStackValue(args->at(i));
     }
   }
 
   // Record source position of the IC call.
   SetSourcePosition(expr->position());
   Handle<Code> ic = CallIC::initialize_stub(
       isolate(), arg_count, call_type);
   __ mov(r3, Operand(SmiFromSlot(expr->CallFeedbackSlot())));
   __ ldr(r1, MemOperand(sp, (arg_count + 1) * kPointerSize));
-  // Don't assign a type feedback id to the IC, since type feedback is provided
-  // by the vector above.
-  CallIC(ic);
+  CallIC(ic, TypeFeedbackId(expr->CallFeedbackSlot().ToInt()));
 
   RecordJSReturnSite(expr);
   // Restore context register.
   __ ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
   context()->DropAndPlug(1, r0);
 }
 
 
 void FullCodeGenerator::EmitResolvePossiblyDirectEval(int arg_count) {
   // r4: copy of the first argument or undefined if it doesn't exist.
@@ skipping 2285 matching lines @@
 
   DCHECK(interrupt_address ==
          isolate->builtins()->OsrAfterStackCheck()->entry());
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM