Adapt Danno's Track Allocation Info idea to fast literals. When allocating a literal array,

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index 7b41defabfecd86fbf47cfe8206e59f099f40591..90e357c78a6fd78260da76fe1b503be80b7bc0b8 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -3051,6 +3051,39 @@ void MacroAssembler::CheckEnumCache(Label* call_runtime) {
   j(not_equal, &next);
 }
 
+
+void MacroAssembler::PerformAllocationSiteInfoCheck(
+    Label* allocation_info_present) {
+  Label no_info_available;
+  // ----------- S t a t e -------------
+  //  -- edx    : receiver
+  //  edi is clobbered.
+  // -----------------------------------
+  ExternalReference new_space_start =
+      ExternalReference::new_space_start(isolate());
+  ExternalReference new_space_allocation_top =
+      ExternalReference::new_space_allocation_top_address(isolate());
+
+  lea(edi, Operand(edx, JSArray::kSize + AllocationSiteInfo::kSize));
+  cmp(edi, Immediate(new_space_start));
+  j(less, &no_info_available);
+  cmp(edi, Operand::StaticVariable(new_space_allocation_top));
+  j(greater_equal, &no_info_available);
+  cmp(MemOperand(edi, 0),
+      Immediate(Handle<Map>(isolate()->heap()->
+                               allocation_site_info_map())));
+
+  // Use the j/jmp sequence below for debugging, but the j(equal) sequence
+  // for production.
+  // j(not_equal, &no_info_available);
+  // int3();
+  // jmp(allocation_info_present);
+  // or
+  j(equal, allocation_info_present);
+  bind(&no_info_available);
+}
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32