[builtins] Add support for JS builtins written in TurboFan.

src/crankshaft/hydrogen.cc

Index: src/crankshaft/hydrogen.cc
diff --git a/src/crankshaft/hydrogen.cc b/src/crankshaft/hydrogen.cc
index 5793ba91638b515ec46f480720089f91f179e64a..a0cad1a90448720de642f227e7893ecb8eeeea4d 100644
--- a/src/crankshaft/hydrogen.cc
+++ b/src/crankshaft/hydrogen.cc
@@ -12752,15 +12752,6 @@ void HOptimizedGraphBuilder::GenerateMathLogRT(CallRuntime* call) {
 }
 
 
-void HOptimizedGraphBuilder::GenerateMathSqrt(CallRuntime* call) {
-  DCHECK(call->arguments()->length() == 1);
-  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
-  HValue* value = Pop();
-  HInstruction* result = NewUncasted<HUnaryMathOperation>(value, kMathSqrt);
-  return ast_context()->ReturnInstruction(result, call->id());
-}
-
-
 void HOptimizedGraphBuilder::GenerateFixedArrayGet(CallRuntime* call) {
   DCHECK(call->arguments()->length() == 2);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));