DBC: Collect type feedback for fastpath smi ops

runtime/vm/object_dbc_test.cc

Index: runtime/vm/object_dbc_test.cc
diff --git a/runtime/vm/object_dbc_test.cc b/runtime/vm/object_dbc_test.cc
index 464350d17a73ddbff4a1b3032312a7dff0f8f745..ecb1fa08647a4ea4f27b5efaa291e9545e471c30 100644
--- a/runtime/vm/object_dbc_test.cc
+++ b/runtime/vm/object_dbc_test.cc
@@ -16,14 +16,12 @@ namespace dart {
 
 // Generate a simple dart code sequence.
 // This is used to test Code and Instruction object creation.
+// For other architectures, this sequence does do an increment, hence the name.
+// On DBC, we don't do an increment because generating an instance call here
+// would be too complex.
 void GenerateIncrement(Assembler* assembler) {
   __ Frame(1);
-  __ LoadConstant(0, Smi::Handle(Smi::New(0)));
-  __ PushConstant(Smi::Handle(Smi::New(1)));
-  __ Push(0);
-  __ AddTOS();
-  __ Trap();
-  __ PopLocal(0);
+  __ LoadConstant(0, Smi::Handle(Smi::New(1)));
   __ Return(0);
 }