![[RFC][TableGen] Add let append/prepend syntax for field concatenation](https://us1.discourse-cdn.com/flex021/uploads/llvm/original/1X/6ac54669f4b30cb07094375cbd65d24163b5b6e0.jpeg)
[RFC][TableGen] Add let append/prepend syntax for field concatenation
• Motivation LLVM TableGen currently lacks a way to accumulate field values across class hierarchies. • When a derived class sets a field via let , it completely replaces the paren