Intrinsify OnebyteString's substringUnchecked. Significant performance improvement on Json benchmar…

runtime/vm/intrinsifier.h

 // Copyright (c) 2012, 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.
 // Class for intrinsifying functions.
 
 #ifndef VM_INTRINSIFIER_H_
 #define VM_INTRINSIFIER_H_
 
 #include "vm/allocation.h"
 
@@ skipping 62 matching lines @@
   V(_GrowableObjectArray, _setData, GrowableArray_setData, 629110947)          \
   V(_GrowableObjectArray, add, GrowableArray_add, 2139340847)                  \
   V(_ImmutableArray, [], ImmutableArray_getIndexed, 486821199)                 \
   V(_ImmutableArray, get:length, ImmutableArray_getLength, 433698233)          \
   V(Object, ==, Object_equal, 2126867222)                                      \
   V(_StringBase, get:hashCode, String_getHashCode, 320803993)                  \
   V(_StringBase, get:isEmpty, String_getIsEmpty, 110632481)                    \
   V(_StringBase, get:length, String_getLength, 320803993)                      \
   V(_StringBase, codeUnitAt, String_codeUnitAt, 984449525)                     \
   V(_OneByteString, get:hashCode, OneByteString_getHashCode, 682660413)        \
+  V(_OneByteString, _substringUncheckedNative,                                 \
+      OneByteString_substringUnchecked, 713121438)                             \
 
 
 #define MATH_LIB_INTRINSIC_LIST(V)                                             \
   V(::, sqrt, Math_sqrt, 1662640002)                                           \
   V(::, sin, Math_sin, 1273932041)                                             \
   V(::, cos, Math_cos, 1749547468)                                             \
 
 
 #define TYPEDDATA_LIB_INTRINSIC_LIST(V)                                        \
   V(_TypedList, get:length, TypedData_getLength, 231908172)                    \
@@ skipping 45 matching lines @@
   CORE_LIB_INTRINSIC_LIST(DECLARE_FUNCTION)
   MATH_LIB_INTRINSIC_LIST(DECLARE_FUNCTION)
   TYPEDDATA_LIB_INTRINSIC_LIST(DECLARE_FUNCTION)
 
 #undef DECLARE_FUNCTION
 };
 
 }  // namespace dart
 
 #endif  // VM_INTRINSIFIER_H_