Move confused_type_with_std_module to ResolverOutputs

This eliminates untracked global state from `Session`.

compiler/rustc_middle/src/ty/mod.rs

@@ -137,6 +137,9 @@ pub struct ResolverOutputs {
     /// A list of proc macro LocalDefIds, written out in the order in which
     /// they are declared in the static array generated by proc_macro_harness.
     pub proc_macros: Vec<LocalDefId>,
+    /// Mapping from ident span to path span for paths that don't exist as written, but that
+    /// exist under `std`. For example, wrote `str::from_utf8` instead of `std::str::from_utf8`.
+    pub confused_type_with_std_module: FxHashMap<Span, Span>,
 }
 
 #[derive(Clone, Copy, Debug)]