Include multiplication in the megamorphic cache hash to avoid cid ranges overlapping modulo table s…

runtime/vm/stub_code_ia32.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 2011 matching lines @@
 
 void StubCode::EmitMegamorphicLookup(Assembler* assembler) {
   __ LoadTaggedClassIdMayBeSmi(EAX, EBX);
   // EAX: class ID of the receiver (smi).
   __ movl(EDI, FieldAddress(ECX, MegamorphicCache::buckets_offset()));
   __ movl(EBX, FieldAddress(ECX, MegamorphicCache::mask_offset()));
   // EDI: cache buckets array.
   // EBX: mask.
   __ pushl(ECX);  // Spill MegamorphicCache.
   __ movl(ECX, EAX);
+  __ imull(ECX, Immediate(MegamorphicCache::kSpreadFactor));
   // ECX: probe.
 
   Label loop, update, load_target_function;
   __ jmp(&loop);
 
   __ Bind(&update);
   __ addl(ECX, Immediate(Smi::RawValue(1)));
   __ Bind(&loop);
   __ andl(ECX, EBX);
   const intptr_t base = Array::data_offset();
@@ skipping 48 matching lines @@
 
 
 
 void StubCode::GenerateFrameAwaitingMaterializationStub(Assembler* assembler) {
   __ int3();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32