Revert of [builtins] Introduce proper Float64Exp operator.

src/crankshaft/mips64/lithium-mips64.h

Index: src/crankshaft/mips64/lithium-mips64.h
diff --git a/src/crankshaft/mips64/lithium-mips64.h b/src/crankshaft/mips64/lithium-mips64.h
index cc44ae6f436d1ef6f632737380889c72eb903f58..5d282ec7aa9f72886e83ce2eb79adeddfa5e04ad 100644
--- a/src/crankshaft/mips64/lithium-mips64.h
+++ b/src/crankshaft/mips64/lithium-mips64.h
@@ -900,11 +900,24 @@
   DECLARE_CONCRETE_INSTRUCTION(MathClz32, "math-clz32")
 };
 
-class LMathExp final : public LTemplateInstruction<1, 1, 0> {
- public:
-  explicit LMathExp(LOperand* value) { inputs_[0] = value; }
-
-  LOperand* value() { return inputs_[0]; }
+
+class LMathExp final : public LTemplateInstruction<1, 1, 3> {
+ public:
+  LMathExp(LOperand* value,
+           LOperand* double_temp,
+           LOperand* temp1,
+           LOperand* temp2) {
+    inputs_[0] = value;
+    temps_[0] = temp1;
+    temps_[1] = temp2;
+    temps_[2] = double_temp;
+    ExternalReference::InitializeMathExpData();
+  }
+
+  LOperand* value() { return inputs_[0]; }
+  LOperand* temp1() { return temps_[0]; }
+  LOperand* temp2() { return temps_[1]; }
+  LOperand* double_temp() { return temps_[2]; }
 
   DECLARE_CONCRETE_INSTRUCTION(MathExp, "math-exp")
 };