[intrinsics] Remove unused %_RegExpExec and %_NumberToString.

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-type-bounds.h"
@@ skipping 2148 matching lines @@
   F(Call)                              \
   F(ToInteger)                         \
   F(ToObject)                          \
   F(ToString)                          \
   F(ToLength)                          \
   F(ToNumber)                          \
   F(IsJSReceiver)                      \
   F(DebugBreakInOptimizedCode)         \
   F(StringCharCodeAt)                  \
   F(SubString)                         \
-  F(RegExpExec)                        \
-  F(NumberToString)                    \
   F(DebugIsActive)                     \
   /* Typed Arrays */                   \
   F(TypedArrayInitialize)              \
   F(MaxSmi)                            \
   F(TypedArrayMaxSizeInHeap)           \
   F(ArrayBufferViewGetByteLength)      \
   F(ArrayBufferViewGetByteOffset)      \
   F(TypedArrayGetLength)               \
   /* ArrayBuffer */                    \
   F(ArrayBufferGetByteLength)          \
@@ skipping 816 matching lines @@
   }
 
  private:
   HOptimizedGraphBuilder* builder_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_HYDROGEN_H_