llvm-project

5cef6f38 - [llvm][mustache] Use BumpPtrAllocator to save ASTNodes (#159194)

[llvm][mustache] Use BumpPtrAllocator to save ASTNodes (#159194) We make the Mustache ASTNodes usable in the arena by first removing all of the memory owning data structures, like std::vector, std::unique_ptr, and SmallVector. We use standard LLVM list types to hold this data instead, and make use of a UniqueStringSaver to hold the various templates strings. Additionally, update clang-doc APIs to use the new interfaces. Future work can make better use of Twine interfaces to help avoid any intermediate copies or allocations.