DBC: Eager deoptimization and CheckSmi instruction.

runtime/vm/constants_dbc.h

 // Copyright (c) 2016, 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.
 
 #ifndef VM_CONSTANTS_DBC_H_
 #define VM_CONSTANTS_DBC_H_
 
 #include "platform/globals.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 341 matching lines @@
 //    If D == 0 then trigger lazy deoptimization.
 //
 //    The meaning of operand ArgC (encoded as A operand) matches that of an
 //    ArgC operand in call instructions. This is needed because we could
 //    potentially patch calls instructions with a lazy deopt and we need to
 //    ensure that any Return/ReturnTOS instructions
 //    returning from the patched calls will continue to function,
 //    e.g. in bytecode sequences like
 //
 //    InstanceCall ... <- lazy deopt inside first call
-//    InstanceCall ... <- patches seconds call with Deopt
+//    InstanceCall ... <- patches second call with Deopt
 //
 // BYTECODE LIST FORMAT
 //
 // Bytecode list below is specified using the following format:
 //
 //     V(BytecodeName, OperandForm, Op1, Op2, Op3)
 //
 // - OperandForm specifies operand encoding and should be one of 0, A, T, A_D,
 //   A_X, X, D (see ENCODING section above).
 //
@@ skipping 195 matching lines @@
   kNumberOfDummyFpuRegisters,
 };
 const FpuRegister FpuTMP = kFakeFpuRegister;
 const intptr_t kNumberOfFpuRegisters = 1;
 
 enum Condition { EQ, NE };
 
 }  // namespace dart
 
 #endif  // VM_CONSTANTS_DBC_H_