[WASM] Replace relative ptr use for async func ptr with absolute ptr

Author: kateinoigakukun

lib/IRGen/IRGenFunction.cpp

@@ -318,6 +318,14 @@ IRGenFunction::emitLoadOfRelativePointer(Address addr, bool isFar,
   if (!isFar) {
     value = Builder.CreateSExt(value, IGM.IntPtrTy);
   }
+
+  // FIXME: add absolute pointer mode for IRGen
+  if (IGM.TargetInfo.OutputObjectFormat == llvm::Triple::Wasm) {
+    auto *uncastPointer = Builder.CreateIntToPtr(value, IGM.Int8PtrTy);
+    auto uncastPointerAddress = Address(uncastPointer, IGM.getPointerAlignment());
+    auto pointer = Builder.CreateBitCast(uncastPointerAddress, expectedType);
+    return pointer.getAddress();
+  }
   auto *addrInt = Builder.CreatePtrToInt(addr.getAddress(), IGM.IntPtrTy);
   auto *uncastPointerInt = Builder.CreateAdd(addrInt, value);
   auto *uncastPointer = Builder.CreateIntToPtr(uncastPointerInt, IGM.Int8PtrTy);