Revert "Clean up runtime functions for Maths."

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index d4aa64eb4b7834495fe5277672ff89da704b8307..a7ef0cbd056c5b99f7ce490ad1b0d4f2df4f5295 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -10785,15 +10785,6 @@ void HOptimizedGraphBuilder::GenerateMathSqrt(CallRuntime* call) {
 }
 
 
-void HOptimizedGraphBuilder::GenerateMathExp(CallRuntime* call) {
-  ASSERT(call->arguments()->length() == 1);
-  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
-  HValue* value = Pop();
-  HInstruction* result = NewUncasted<HUnaryMathOperation>(value, kMathExp);
-  return ast_context()->ReturnInstruction(result, call->id());
-}
-
-
 void HOptimizedGraphBuilder::GenerateGetCachedArrayIndex(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));