Revert of [builtins] Introduce proper Float64Exp operator.

src/builtins.h

 // Copyright 2011 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_BUILTINS_H_
 #define V8_BUILTINS_H_
 
 #include "src/base/flags.h"
 #include "src/handles.h"
 
@@ skipping 302 matching lines @@
 // Define list of builtins implemented in TurboFan (with JS linkage).
 #define BUILTIN_LIST_T(V)             \
   V(FunctionPrototypeHasInstance, 2)  \
   V(GeneratorPrototypeNext, 2)        \
   V(GeneratorPrototypeReturn, 2)      \
   V(GeneratorPrototypeThrow, 2)       \
   V(MathAtan, 2)                      \
   V(MathAtan2, 3)                     \
   V(MathCeil, 2)                      \
   V(MathClz32, 2)                     \
-  V(MathExp, 2)                       \
   V(MathFloor, 2)                     \
   V(MathLog, 2)                       \
   V(MathLog1p, 2)                     \
   V(MathLog2, 2)                      \
   V(MathLog10, 2)                     \
   V(MathRound, 2)                     \
   V(MathSqrt, 2)                      \
   V(MathTrunc, 2)                     \
   V(ObjectHasOwnProperty, 2)          \
   V(ArrayIsArray, 2)                  \
@@ skipping 294 matching lines @@
   static void Generate_ArrayCode(MacroAssembler* masm);
 
   // ES6 section 20.2.2.6 Math.atan ( x )
   static void Generate_MathAtan(CodeStubAssembler* assembler);
   // ES6 section 20.2.2.8 Math.atan2 ( y, x )
   static void Generate_MathAtan2(CodeStubAssembler* assembler);
   // ES6 section 20.2.2.10 Math.ceil ( x )
   static void Generate_MathCeil(CodeStubAssembler* assembler);
   // ES6 section 20.2.2.11 Math.clz32 ( x )
   static void Generate_MathClz32(CodeStubAssembler* assembler);
-  // ES6 section 20.2.2.14 Math.exp ( x )
-  static void Generate_MathExp(CodeStubAssembler* assembler);
   // ES6 section 20.2.2.16 Math.floor ( x )
   static void Generate_MathFloor(CodeStubAssembler* assembler);
   // ES6 section 20.2.2.20 Math.log ( x )
   static void Generate_MathLog(CodeStubAssembler* assembler);
   // ES6 section 20.2.2.21 Math.log ( x )
   static void Generate_MathLog1p(CodeStubAssembler* assembler);
 
   static void Generate_MathLog2(CodeStubAssembler* assembler);
   static void Generate_MathLog10(CodeStubAssembler* assembler);
 
@@ skipping 95 matching lines @@
   friend class BuiltinFunctionTable;
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(Builtins);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_BUILTINS_H_