Checker does not use constant variables for implicit enum member values #3604

const source = 4;
enum E { A = source, B }
console.log(E.B);

TypeScript 6.0.3 accepts this and its JavaScript prints 5 in Node. SharpTS with --no-tsconfig --strict --noEmit reports TS1061 for B. The enum constant evaluator recognizes arithmetic and earlier enum members but does not resolve const variable initializers. This also happens with const source = 1 << 2. Found while verifying #3572.