This PR is part of #1880.
`Token` size is reduced from 48 to 40 bytes.
To reconstruct the regex pattern and flags within the parser , the regex
string is
re-parsed from the end by reading all valid flags.
In order to make things work nicely, the lexer will no longer recover
from a invalid regex.
The regression case in typescript is as expected since we don't
currently store `AccessorProperty` in `ClassTable`.
The following code is one of those cases
```ts
class C1 {
accessor #a: any;
accessor #b = 1;
static accessor #c: any;
static accessor #d = 2;
constructor() {
this.#a = 3;
this.#b = 4;
}
static {
this.#c = 5;
this.#d = 6;
}
}
```
But there was an error
```shell
Expect to Parse: "conformance/classes/propertyMemberDeclarations/autoAccessor2.ts"
× Private field 'a' must be declared in an enclosing class
╭─[conformance/classes/propertyMemberDeclarations/autoAccessor2.ts:9:1]
9 │ constructor() {
10 │ this.#a = 3;
· ──
11 │ this.#b = 4;
╰────
```
Let's leave it alone for now. Because of the `AccessorProperty` I
haven't seen it in any repo.
