Revert of [builtins] Introduce proper Float64Exp operator.

src/crankshaft/ia32/lithium-ia32.cc

Index: src/crankshaft/ia32/lithium-ia32.cc
diff --git a/src/crankshaft/ia32/lithium-ia32.cc b/src/crankshaft/ia32/lithium-ia32.cc
index 22e923e86899bd91e7247940e44acb07ad43bb09..5e9561bfc076d2d024d376a7993ac4135ecf6822 100644
--- a/src/crankshaft/ia32/lithium-ia32.cc
+++ b/src/crankshaft/ia32/lithium-ia32.cc
@@ -1181,8 +1181,11 @@
 LInstruction* LChunkBuilder::DoMathExp(HUnaryMathOperation* instr) {
   DCHECK(instr->representation().IsDouble());
   DCHECK(instr->value()->representation().IsDouble());
-  LOperand* input = UseRegisterAtStart(instr->value());
-  return MarkAsCall(DefineSameAsFirst(new (zone()) LMathExp(input)), instr);
+  LOperand* value = UseTempRegister(instr->value());
+  LOperand* temp1 = TempRegister();
+  LOperand* temp2 = TempRegister();
+  LMathExp* result = new(zone()) LMathExp(value, temp1, temp2);
+  return DefineAsRegister(result);
 }