Added attributions in all attributed files

lib/compiler-cranelift/src/func_environ.rs

@@ -1,3 +1,6 @@
+// This file contains partial code from other sources.
+// Attributions: https://github.com/wasmerio/wasmer-reborn/blob/master/ATTRIBUTIONS.md
+
 use crate::translator::{
     type_to_irtype, FuncEnvironment as BaseFuncEnvironment, GlobalVariable, TargetEnvironment,
 };