Revert of [builtins] Introduce proper Float64Exp operator.

src/compiler/machine-operator.cc

 // Copyright 2014 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/compiler/machine-operator.h"
 
 #include "src/base/lazy-instance.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 
@@ skipping 139 matching lines @@
   V(Float32Abs, Operator::kNoProperties, 1, 0, 1)                             \
   V(Float32Add, Operator::kCommutative, 2, 0, 1)                              \
   V(Float32Sub, Operator::kNoProperties, 2, 0, 1)                             \
   V(Float32SubPreserveNan, Operator::kNoProperties, 2, 0, 1)                  \
   V(Float32Mul, Operator::kCommutative, 2, 0, 1)                              \
   V(Float32Div, Operator::kNoProperties, 2, 0, 1)                             \
   V(Float32Sqrt, Operator::kNoProperties, 1, 0, 1)                            \
   V(Float64Abs, Operator::kNoProperties, 1, 0, 1)                             \
   V(Float64Atan, Operator::kNoProperties, 1, 0, 1)                            \
   V(Float64Atan2, Operator::kNoProperties, 2, 0, 1)                           \
-  V(Float64Exp, Operator::kNoProperties, 1, 0, 1)                             \
   V(Float64Log, Operator::kNoProperties, 1, 0, 1)                             \
   V(Float64Log1p, Operator::kNoProperties, 1, 0, 1)                           \
   V(Float64Log2, Operator::kNoProperties, 1, 0, 1)                            \
   V(Float64Log10, Operator::kNoProperties, 1, 0, 1)                           \
   V(Float64Add, Operator::kCommutative, 2, 0, 1)                              \
   V(Float64Sub, Operator::kNoProperties, 2, 0, 1)                             \
   V(Float64SubPreserveNan, Operator::kNoProperties, 2, 0, 1)                  \
   V(Float64Mul, Operator::kCommutative, 2, 0, 1)                              \
   V(Float64Div, Operator::kNoProperties, 2, 0, 1)                             \
   V(Float64Mod, Operator::kNoProperties, 2, 0, 1)                             \
@@ skipping 527 matching lines @@
   }
   ATOMIC_REPRESENTATION_LIST(STORE)
 #undef STORE
   UNREACHABLE();
   return nullptr;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8