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Boaz Brickner
a4a229b637
This is a followup of [a comment](https://github.com/carbon-language/carbon-lang/pull/5062/files/89e56d51858bcc18d4242d4e5c9ee0e7496d887e#r1979993815) in #5062. Add a mutable AST pointer to `FileContext`. This is necessary since we use [Clang with lack of const correctness](https://github.com/llvm/llvm-project/pull/130096#issuecomment-2704413782). Alternatives in Clang: * Change `ASTUnit::getASTContext() const` to return a non-const `ASTContext`. [Tried and was rejected upstream due to weakening const correctness](https://github.com/llvm/llvm-project/pull/130096). * Change `createMangleContext()` to be `const`. Tried that and it seems like it relies heavily on non const API. * Change `MangleContext::mangleName()` to `const`. Tried that but there are several lazy initialization and id creations happening that modify the context. See details in https://github.com/llvm/llvm-project/pull/130613. Alternatives in Carbon: * Use `const_cast` on `ASTContext` when calling `createMangleContext()`. * Make `FileContext::sem_ir_` point to a mutable `SemIR::File`. * Change `File::cpp_ast()` to be const while keeping it return a mutable pointer. Part of #4666.