Rename some name variables as ident.

It bugs me when variables of type `Ident` are called `name`. It leads to
silly things like `name.name`. `Ident` variables should be called
`ident`, and `name` should be used for variables of type `Symbol`.

This commit improves things by by doing `s/name/ident/` on a bunch of
`Ident` variables. Not all of them, but a decent chunk.

Author: nnethercote

Diff for: src/main_shim.rs

@@ -104,7 +104,7 @@ pub(crate) fn maybe_create_entry_wrapper(
                 let termination_trait = tcx.require_lang_item(LangItem::Termination, None);
                 let report = tcx
                     .associated_items(termination_trait)
-                    .find_by_name_and_kind(
+                    .find_by_ident_and_kind(
                         tcx,
                         Ident::from_str("report"),
                         AssocKind::Fn,