Revert of [fullcodegen] Remove the hacky %_FastOneByteArrayJoin intrinsic.

src/crankshaft/hydrogen.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CRANKSHAFT_HYDROGEN_H_
 #define V8_CRANKSHAFT_HYDROGEN_H_
 
 #include "src/accessors.h"
 #include "src/allocation.h"
 #include "src/ast/ast.h"
@@ skipping 2195 matching lines @@
   F(ToInteger)                         \
   F(ToName)                            \
   F(ToObject)                          \
   F(ToString)                          \
   F(ToLength)                          \
   F(ToNumber)                          \
   F(IsJSReceiver)                      \
   F(MathPow)                           \
   F(HasCachedArrayIndex)               \
   F(GetCachedArrayIndex)               \
+  F(FastOneByteArrayJoin)              \
   F(DebugBreakInOptimizedCode)         \
   F(StringCharCodeAt)                  \
   F(SubString)                         \
   F(RegExpExec)                        \
   F(RegExpConstructResult)             \
   F(RegExpFlags)                       \
   F(RegExpSource)                      \
   F(NumberToString)                    \
   F(DebugIsActive)                     \
   /* Typed Arrays */                   \
@@ skipping 805 matching lines @@
 
  private:
   HGraphBuilder* builder_;
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_HYDROGEN_H_