llvm-project

0bd992a8 - [clang AST] move mangling API to namespace clang to allow calls from swift-frontend (#137884)

[clang AST] move mangling API to namespace clang to allow calls from swift-frontend (#137884) When implementing `@objcDirect` in Swift, Swift needs to mangle a native `Decl` that is not a clang Node, which in turn don't have access to `clang::MangleContext`. Reimplementing mangling logic in Swift is redundant. This patch moves mangling logic from `clang::MangleContext` to `clang` using only basic types (`StringRef`, `std::optional`, etc.), such that Swift can we can just call Clang API: Swift depends on Clang already. We are separating this from #126639 so we can draft the proposal on the Swift side. #126639 will be worked to depend on this PR. Tests: No new tests, old ones should pass with no problem. --------- Signed-off-by: Peter Rong <PeterRong@meta.com>