Revert of [builtins] Introduce proper Float64Exp operator.

test/unittests/compiler/machine-operator-reducer-unittest.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-reducer.h"
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/base/ieee754.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/typer.h"
@@ skipping 1430 matching lines @@
   }
   {
     Reduction const r =
         Reduce(graph()->NewNode(machine()->Float64Atan2(), nan, p0));
     ASSERT_TRUE(r.Changed());
     EXPECT_EQ(nan, r.replacement());
   }
 }
 
 // -----------------------------------------------------------------------------
-// Float64Exp
-
-TEST_F(MachineOperatorReducerTest, Float64ExpWithConstant) {
-  TRACED_FOREACH(double, x, kFloat64Values) {
-    Reduction const r =
-        Reduce(graph()->NewNode(machine()->Float64Exp(), Float64Constant(x)));
-    ASSERT_TRUE(r.Changed());
-    EXPECT_THAT(r.replacement(),
-                IsFloat64Constant(NanSensitiveDoubleEq(base::ieee754::exp(x))));
-  }
-}
-
-// -----------------------------------------------------------------------------
 // Float64Log
 
 TEST_F(MachineOperatorReducerTest, Float64LogWithConstant) {
   TRACED_FOREACH(double, x, kFloat64Values) {
     Reduction const r =
         Reduce(graph()->NewNode(machine()->Float64Log(), Float64Constant(x)));
     ASSERT_TRUE(r.Changed());
     EXPECT_THAT(r.replacement(),
                 IsFloat64Constant(NanSensitiveDoubleEq(base::ieee754::log(x))));
   }
@@ skipping 257 matching lines @@
     Reduction r = Reduce(node);
     ASSERT_TRUE(r.Changed());
     EXPECT_THAT(r.replacement(),
                 IsStore(rep, base, index, value, effect, control));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8