dillon1000/react

[rust-compiler] Use rustc-hash FxHasher for all maps and sets (#36811)

Swaps the default hashers across the Rust compiler crates for
rustc-hash's faster `FxHasher`.

## Why

`FxHasher` is a simple, fast, non-cryptographic hasher. std's default
(SipHash) is DoS-resistant but heavy — the compiler keys maps/sets
almost entirely on small integer IDs (`IdentifierId`, `BlockId`,
`ScopeId`, …) where that protection buys nothing. Switching gives:

- **Performance** — faster hashing on the hot ID-keyed maps/sets used
throughout the passes.
- **Slight binary size reduction** — drops the heavy SipHash hasher
pulled in by std's `HashMap`/`HashSet`.

## Changes

- `std::collections::HashMap`/`HashSet` →
`rustc_hash::FxHashMap`/`FxHashSet`
- `indexmap` `IndexMap`/`IndexSet` now use `FxBuildHasher`, inlined as
`IndexMap<K, V, FxBuildHasher>` (no `FxIndexMap` type aliases)
- `rustc-hash = "2"` added to all 12 crate manifests
- `rustc_hash`/`indexmap` imports consolidated into single brace imports
at the top of each file

The change is serde-neutral: `FxHashMap` and `IndexMap<_, _,
FxBuildHasher>` serialize to byte-identical JSON, and `IndexMap` keeps
insertion order.

`cargo check`, `cargo fmt --check`, and `cargo test` all pass with no
warnings.