Revert of [builtins] Introduce proper Float64Exp operator.

src/crankshaft/x64/lithium-x64.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_X64_LITHIUM_X64_H_
 #define V8_CRANKSHAFT_X64_LITHIUM_X64_H_
 
 #include "src/crankshaft/hydrogen.h"
 #include "src/crankshaft/lithium.h"
 #include "src/crankshaft/lithium-allocator.h"
@@ skipping 891 matching lines @@
  public:
   explicit LMathClz32(LOperand* value) {
     inputs_[0] = value;
   }
 
   LOperand* value() { return inputs_[0]; }
 
   DECLARE_CONCRETE_INSTRUCTION(MathClz32, "math-clz32")
 };
 
-class LMathExp final : public LTemplateInstruction<1, 1, 0> {
+
+class LMathExp final : public LTemplateInstruction<1, 1, 2> {
  public:
-  explicit LMathExp(LOperand* value) { inputs_[0] = value; }
+  LMathExp(LOperand* value, LOperand* temp1, LOperand* temp2) {
+    inputs_[0] = value;
+    temps_[0] = temp1;
+    temps_[1] = temp2;
+    ExternalReference::InitializeMathExpData();
+  }
 
   LOperand* value() { return inputs_[0]; }
+  LOperand* temp1() { return temps_[0]; }
+  LOperand* temp2() { return temps_[1]; }
 
   DECLARE_CONCRETE_INSTRUCTION(MathExp, "math-exp")
 };
 
 
 class LMathSqrt final : public LTemplateInstruction<1, 1, 0> {
  public:
   explicit LMathSqrt(LOperand* value) {
     inputs_[0] = value;
   }
@@ skipping 1719 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_X64_LITHIUM_X64_H_