Merge pull request #65674 from aschwaighofer/opaque_ptrs_async_fun_ptr

IRGen: Fix lowering of static async function pointers under opaque-pointers

Author: aschwaighofer

lib/IRGen/IRGenSIL.cpp

@@ -2761,11 +2761,14 @@ void IRGenSILFunction::visitFunctionRefBaseInst(FunctionRefBaseInst *i) {
   // than indirecting through the async FP.
   llvm::Constant *value;
   llvm::Constant *secondaryValue;
+  bool useSignature = false;
   if (fpKind.isAsyncFunctionPointer()) {
     value = IGM.getAddrOfAsyncFunctionPointer(fn);
     value = llvm::ConstantExpr::getBitCast(value, fnPtr->getType());
     secondaryValue = mayDirectlyCallAsync(fn) ?
       IGM.getAddrOfSILFunction(fn, NotForDefinition) : nullptr;
+    if (!secondaryValue)
+      useSignature = true;
 
   // For ordinary sync functions and special async functions, produce
   // only the direct address of the function.  The runtime does not
@@ -2775,7 +2778,7 @@ void IRGenSILFunction::visitFunctionRefBaseInst(FunctionRefBaseInst *i) {
     secondaryValue = nullptr;
   }
   FunctionPointer fp =
-      FunctionPointer::forDirect(fpKind, value, secondaryValue, sig);
+      FunctionPointer::forDirect(fpKind, value, secondaryValue, sig, useSignature);
   // Update the foreign no-throw information if needed.
   if (const auto *cd = fn->getClangDecl()) {
     if (auto *cfd = dyn_cast<clang::FunctionDecl>(cd)) {