Rollup merge of #121629 - RalfJung:field-shuffle-seed, r=oli-obk

fix some references to no-longer-existing ReprOptions.layout_seed Seems like the field got renamed but some comments not updated.

Author: matthiaskrgr

compiler/rustc_abi/src/layout.rs

@@ -958,7 +958,7 @@ fn univariant<
  #[cfg(feature = "randomize")]
  {
  use rand::{seq::SliceRandom, SeedableRng};
- // `ReprOptions.layout_seed` is a deterministic seed we can use to randomize field
+ // `ReprOptions.field_shuffle_seed` is a deterministic seed we can use to randomize field
  // ordering.
  let mut rng =
  rand_xoshiro::Xoshiro128StarStar::seed_from_u64(repr.field_shuffle_seed);

compiler/rustc_abi/src/lib.rs

@@ -41,7 +41,7 @@ bitflags! {
  // Internal only for now. If true, don't reorder fields.
  const IS_LINEAR = 1 << 3;
  // If true, the type's layout can be randomized using
- // the seed stored in `ReprOptions.layout_seed`
+ // the seed stored in `ReprOptions.field_shuffle_seed`
  const RANDOMIZE_LAYOUT = 1 << 4;
  // Any of these flags being set prevent field reordering optimisation.
  const IS_UNOPTIMISABLE = ReprFlags::IS_C.bits()