Revert of [builtins] Introduce proper Float64Exp operator.

src/builtins.cc

 // 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.
 
 #include "src/builtins.h"
 
 #include "src/api-arguments.h"
 #include "src/api-natives.h"
 #include "src/api.h"
 #include "src/base/ieee754.h"
@@ skipping 2434 matching lines @@
 
   assembler->Bind(&do_clz32);
   {
     Node* x_value = var_clz32_x.value();
     Node* value = assembler->Word32Clz(x_value);
     Node* result = assembler->ChangeInt32ToTagged(value);
     assembler->Return(result);
   }
 }
 
-// ES6 section 20.2.2.14 Math.exp ( x )
-void Builtins::Generate_MathExp(CodeStubAssembler* assembler) {
-  using compiler::Node;
-
-  Node* x = assembler->Parameter(1);
-  Node* context = assembler->Parameter(4);
-  Node* x_value = assembler->TruncateTaggedToFloat64(context, x);
-  Node* value = assembler->Float64Exp(x_value);
-  Node* result = assembler->ChangeFloat64ToTagged(value);
-  assembler->Return(result);
-}
-
 // ES6 section 20.2.2.16 Math.floor ( x )
 void Builtins::Generate_MathFloor(CodeStubAssembler* assembler) {
   Generate_MathRoundingOperation(assembler, &CodeStubAssembler::Float64Floor);
 }
 
 // ES6 section 20.2.2.17 Math.fround ( x )
 BUILTIN(MathFround) {
   HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
   Handle<Object> x = args.at<Object>(1);
@@ skipping 3588 matching lines @@
 BUILTIN_LIST_H(DEFINE_BUILTIN_ACCESSOR_H)
 BUILTIN_LIST_DEBUG_A(DEFINE_BUILTIN_ACCESSOR_A)
 #undef DEFINE_BUILTIN_ACCESSOR_C
 #undef DEFINE_BUILTIN_ACCESSOR_A
 #undef DEFINE_BUILTIN_ACCESSOR_T
 #undef DEFINE_BUILTIN_ACCESSOR_S
 #undef DEFINE_BUILTIN_ACCESSOR_H
 
 }  // namespace internal
 }  // namespace v8