compiler: fix incorrect "exported function" panic

Because the parentHandle parameter wasn't always set to the right value,
the coroutine lowering pass would sometimes panic with "trying to make
exported function async" even though there was no exported function
involved. Therefore, it should unconditionally be set to avoid this.

The parent function doesn't always have the parentHandle function
parameter set because it can only be set after defining a function, not
when it is only declared.

compiler/interface.go

@@ -465,9 +465,7 @@ func (c *compilerContext) getInterfaceInvokeWrapper(f *ir.Function) llvm.Value {
 	paramTypes := append([]llvm.Type{c.i8ptrType}, fnType.ParamTypes()[len(expandedReceiverType):]...)
 	wrapFnType := llvm.FunctionType(fnType.ReturnType(), paramTypes, false)
 	wrapper = llvm.AddFunction(c.mod, wrapperName, wrapFnType)
-	if f.LLVMFn.LastParam().Name() == "parentHandle" {
-		wrapper.LastParam().SetName("parentHandle")
-	}
+	wrapper.LastParam().SetName("parentHandle")
 
 	wrapper.SetLinkage(llvm.InternalLinkage)
 	wrapper.SetUnnamedAddr(true)