Properly handle emojis as literal prefix in macros

Do not accept the following

```rust
macro_rules! lexes {($($_:tt)*) => {}}
lexes!(🐛"foo");
```

Before, invalid emoji identifiers were gated during parsing instead of lexing in all cases, but this didn't account for macro expansion of literal prefixes.

Fix rust-lang#123696.

Properly handle emojis as literal prefix in macros

Do not accept the following

```rust
macro_rules! lexes {($($_:tt)*) => {}}
lexes!(🐛"foo");
```

Before, invalid emoji identifiers were gated during parsing instead of lexing in all cases, but this didn't account for macro pre-expansion of literal prefixes.

Fix rust-lang#123696.

Properly handle emojis as literal prefix in macros

Do not accept the following

```rust
macro_rules! lexes {($($_:tt)*) => {}}
lexes!(🐛"foo");
```

Before, invalid emoji identifiers were gated during parsing instead of lexing in all cases, but this didn't account for macro pre-expansion of literal prefixes.

Fix rust-lang#123696.

Properly handle emojis as literal prefix in macros

Do not accept the following

```rust
macro_rules! lexes {($($_:tt)*) => {}}
lexes!(🐛"foo");
```

Before, invalid emoji identifiers were gated during parsing instead of lexing in all cases, but this didn't account for macro pre-expansion of literal prefixes.

Fix rust-lang#123696.

Properly handle emojis as literal prefix in macros

Do not accept the following

```rust
macro_rules! lexes {($($_:tt)*) => {}}
lexes!(🐛"foo");
```

Before, invalid emoji identifiers were gated during parsing instead of lexing in all cases, but this didn't account for macro pre-expansion of literal prefixes.

Fix rust-lang#123696.

…kingjubilee

Rollup of 6 pull requests

Successful merges:

 - rust-lang#117919 (Introduce perma-unstable `wasm-c-abi` flag)
 - rust-lang#123571 (Correctly change type when adding adjustments on top of `NeverToAny`)
 - rust-lang#123752 (Properly handle emojis as literal prefix in macros)
 - rust-lang#123980 ( Add an opt-in to store incoming edges in `VecGraph` + misc)
 - rust-lang#124110 (Fix negating `f16` and `f128` constants)
 - rust-lang#124116 (when suggesting RUST_BACKTRACE=1, add a special note for Miri's env var isolation)

r? `@ghost`
`@rustbot` modify labels: rollup

Properly handle emojis as literal prefix in macros

Do not accept the following

```rust
macro_rules! lexes {($($_:tt)*) => {}}
lexes!(🐛"foo");
```

Before, invalid emoji identifiers were gated during parsing instead of lexing in all cases, but this didn't account for macro pre-expansion of literal prefixes.

Fix rust-lang#123696.

…kingjubilee

Rollup of 9 pull requests

Successful merges:

 - rust-lang#117919 (Introduce perma-unstable `wasm-c-abi` flag)
 - rust-lang#123406 (Force exhaustion in iter::ArrayChunks::into_remainder)
 - rust-lang#123752 (Properly handle emojis as literal prefix in macros)
 - rust-lang#123935 (Don't inline integer literals when they overflow - new attempt)
 - rust-lang#123980 ( Add an opt-in to store incoming edges in `VecGraph` + misc)
 - rust-lang#124019 (Use raw-dylib for Windows synchronization functions)
 - rust-lang#124110 (Fix negating `f16` and `f128` constants)
 - rust-lang#124112 (Fix ICE when there is a non-Unicode entry in the incremental crate directory)
 - rust-lang#124116 (when suggesting RUST_BACKTRACE=1, add a special note for Miri's env var isolation)

r? `@ghost`
`@rustbot` modify labels: rollup

…kingjubilee

Rollup of 7 pull requests

Successful merges:

 - rust-lang#123406 (Force exhaustion in iter::ArrayChunks::into_remainder)
 - rust-lang#123752 (Properly handle emojis as literal prefix in macros)
 - rust-lang#123935 (Don't inline integer literals when they overflow - new attempt)
 - rust-lang#123980 ( Add an opt-in to store incoming edges in `VecGraph` + misc)
 - rust-lang#124019 (Use raw-dylib for Windows synchronization functions)
 - rust-lang#124110 (Fix negating `f16` and `f128` constants)
 - rust-lang#124116 (when suggesting RUST_BACKTRACE=1, add a special note for Miri's env var isolation)

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup merge of rust-lang#123752 - estebank:emoji-prefix, r=wesleywiser

Properly handle emojis as literal prefix in macros

Do not accept the following

```rust
macro_rules! lexes {($($_:tt)*) => {}}
lexes!(🐛"foo");
```

Before, invalid emoji identifiers were gated during parsing instead of lexing in all cases, but this didn't account for macro pre-expansion of literal prefixes.

Fix rust-lang#123696.

This bug is now fixed in stable rustc.

See
rust-lang/rust#123696
rust-lang/rust#123752

It was added in rust-lang#123752 to handle some cases involving emoji, but it
isn't necessary because it's always treated the same as
`TokenKind::InvalidIdent`. This commit removes it, which makes things a
little simpler.