Rollup merge of #99011 - oli-obk:UnsoundCell, r=eddyb

`UnsafeCell` blocks niches inside its nested type from being available outside

fixes #87341

This implements the plan by `@eddyb` in https://github.com/rust-lang/rust/issues/87341#issuecomment-886083646

Somewhat related PR (not strictly necessary, but that cleanup made this PR simpler): #94527

compiler/rustc_middle/src/ty/mod.rs

@@ -1720,11 +1720,9 @@ bitflags! {
         const IS_TRANSPARENT     = 1 << 2;
         // Internal only for now. If true, don't reorder fields.
         const IS_LINEAR          = 1 << 3;
-        // If true, don't expose any niche to type's context.
-        const HIDE_NICHE         = 1 << 4;
         // If true, the type's layout can be randomized using
         // the seed stored in `ReprOptions.layout_seed`
-        const RANDOMIZE_LAYOUT   = 1 << 5;
+        const RANDOMIZE_LAYOUT   = 1 << 4;
         // Any of these flags being set prevent field reordering optimisation.
         const IS_UNOPTIMISABLE   = ReprFlags::IS_C.bits
                                  | ReprFlags::IS_SIMD.bits
@@ -1781,7 +1779,6 @@ impl ReprOptions {
                         ReprFlags::empty()
                     }
                     attr::ReprTransparent => ReprFlags::IS_TRANSPARENT,
-                    attr::ReprNoNiche => ReprFlags::HIDE_NICHE,
                     attr::ReprSimd => ReprFlags::IS_SIMD,
                     attr::ReprInt(i) => {
                         size = Some(i);
@@ -1834,11 +1831,6 @@ impl ReprOptions {
         self.flags.contains(ReprFlags::IS_LINEAR)
     }
 
-    #[inline]
-    pub fn hide_niche(&self) -> bool {
-        self.flags.contains(ReprFlags::HIDE_NICHE)
-    }
-
     /// Returns the discriminant type, given these `repr` options.
     /// This must only be called on enums!
     pub fn discr_type(&self) -> attr::IntType {