Index: lib/Target/WebAssembly/WebAssemblyFixFunctionBitcasts.cpp
===================================================================
--- lib/Target/WebAssembly/WebAssemblyFixFunctionBitcasts.cpp
+++ lib/Target/WebAssembly/WebAssemblyFixFunctionBitcasts.cpp
@@ -257,11 +257,6 @@
     if (!Ty)
       continue;
 
-    // Bitcasted vararg functions occur in Emscripten's implementation of
-    // EM_ASM, so suppress wrappers for them for now.
-    if (TemporaryWorkarounds && (Ty->isVarArg() || F->isVarArg()))
-      continue;
-
     auto Pair = Wrappers.insert(std::make_pair(std::make_pair(F, Ty), nullptr));
     if (Pair.second)
       Pair.first->second = CreateWrapper(F, Ty);