Set linkage for windows

Author: gbaraldi

src/aotcompile.cpp

@@ -1690,6 +1690,10 @@ void jl_dump_native_impl(void *native_code,
         auto F = Function::Create(FT, Function::ExternalLinkage, "get_jl_RTLD_DEFAULT_handle_pointer", metadataM);
         llvm::IRBuilder<> builder(BasicBlock::Create(Context, "top", F));
         builder.CreateRet(jlRTLD_DEFAULT_var);
+        F->setLinkage(GlobalValue::ExternalLinkage);
+        if (TheTriple.isOSWindows()) {
+            F->setDLLStorageClass(GlobalValue::DLLStorageClassTypes::DLLExportStorageClass);
+        }
         if (TheTriple.isOSWindows()) {
             // Windows expect that the function `_DllMainStartup` is present in an dll.
             // Normal compilers use something like Zig's crtdll.c instead we provide a