Rollup merge of #81913 - osa1:rename_unop_variants, r=matthewjasper

Rename HIR UnOp variants

This renames the variants in HIR UnOp from

    enum UnOp {
        UnDeref,
        UnNot,
        UnNeg,
    }

to

    enum UnOp {
        Deref,
        Not,
        Neg,
    }

Motivations:

- This is more consistent with the rest of the code base where most enum
  variants don't have a prefix.

- These variants are never used without the `UnOp` prefix so the extra
  `Un` prefix doesn't help with readability. E.g. we don't have any
  `UnDeref`s in the code, we only have `UnOp::UnDeref`.

- MIR `UnOp` type variants don't have a prefix so this is more
  consistent with MIR types.

- "un" prefix reads like "inverse" or "reverse", so as a beginner in
  rustc code base when I see "UnDeref" what comes to my mind is
  something like `&*` instead of just `*`.

compiler/rustc_lint/src/types.rs

@@ -472,7 +472,7 @@ fn lint_literal<'tcx>(
 impl<'tcx> LateLintPass<'tcx> for TypeLimits {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx hir::Expr<'tcx>) {
         match e.kind {
-            hir::ExprKind::Unary(hir::UnOp::UnNeg, ref expr) => {
+            hir::ExprKind::Unary(hir::UnOp::Neg, ref expr) => {
                 // propagate negation, if the negation itself isn't negated
                 if self.negated_expr_id != Some(e.hir_id) {
                     self.negated_expr_id = Some(expr.hir_id);