[builtins] Introduce proper Float64Exp operator.

src/crankshaft/arm64/lithium-arm64.h

 // Copyright 2013 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_ARM64_LITHIUM_ARM64_H_
 #define V8_CRANKSHAFT_ARM64_LITHIUM_ARM64_H_
 
 #include "src/crankshaft/hydrogen.h"
 #include "src/crankshaft/lithium.h"
 #include "src/crankshaft/lithium-allocator.h"
@@ skipping 1745 matching lines @@
   LOperand* context() { return inputs_[0]; }
   LOperand* value() { return inputs_[1]; }
   LOperand* temp1() { return temps_[0]; }
   LOperand* temp2() { return temps_[1]; }
   LOperand* temp3() { return temps_[2]; }
 
   DECLARE_CONCRETE_INSTRUCTION(MathAbsTagged, "math-abs-tagged")
   DECLARE_HYDROGEN_ACCESSOR(UnaryMathOperation)
 };
 
-
-class LMathExp final : public LUnaryMathOperation<4> {
+class LMathExp final : public LUnaryMathOperation<0> {
  public:
-  LMathExp(LOperand* value,
-                LOperand* double_temp1,
-                LOperand* temp1,
-                LOperand* temp2,
-                LOperand* temp3)
-      : LUnaryMathOperation<4>(value) {
-    temps_[0] = double_temp1;
-    temps_[1] = temp1;
-    temps_[2] = temp2;
-    temps_[3] = temp3;
-    ExternalReference::InitializeMathExpData();
-  }
-
-  LOperand* double_temp1() { return temps_[0]; }
-  LOperand* temp1() { return temps_[1]; }
-  LOperand* temp2() { return temps_[2]; }
-  LOperand* temp3() { return temps_[3]; }
+  explicit LMathExp(LOperand* value) : LUnaryMathOperation<0>(value) {}
 
   DECLARE_CONCRETE_INSTRUCTION(MathExp, "math-exp")
 };
 
 
 // Math.floor with a double result.
 class LMathFloorD final : public LUnaryMathOperation<0> {
  public:
   explicit LMathFloorD(LOperand* value) : LUnaryMathOperation<0>(value) { }
   DECLARE_CONCRETE_INSTRUCTION(MathFloorD, "math-floor-d")
@@ skipping 1228 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_ARM64_LITHIUM_ARM64_H_