Function uninit-call should use terminate_with

Summary: When the Function signature is `noexcept`, rather than using `throw_exception`, in order to save a bit of generated code size.

Reviewed By: luciang

Differential Revision: D34190570

fbshipit-source-id: c0f9cbd6abffd9b1517d28126d8eb5c491089ea8

folly/Function.h

@@ -539,7 +539,7 @@ struct FunctionTraits<ReturnType(Args...) const noexcept> {
   }
 
   static ReturnType uninitCall(CallArg<Args>..., Data&) noexcept {
-    throw_exception<std::bad_function_call>();
+    terminate_with<std::bad_function_call>();
   }
 
   ReturnType operator()(Args... args) const noexcept {