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

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 32572e42952c7fb804ac5670b91afb69898ac7b4..1862edcd2ed108bbedd857c3965700452a73ab42 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -1586,7 +1586,6 @@ Type* Typer::Visitor::TypeJSCallRuntime(Node* node) {
       return Type::Signed32();
     case Runtime::kInlineConstructDouble:
     case Runtime::kInlineMathFloor:
-    case Runtime::kInlineMathSqrt:
     case Runtime::kInlineMathAtan2:
       return Type::Number();
     case Runtime::kInlineMathClz32: