[llvm-dev] TableGen [sub]class name as a string

[Tyro Software via llvm-dev]

I'm hoping for a way to incorporate the name of a leaf class into a base
class' definition. Something like:

class BASE<dag oops, dag iops, ...
  let Trace = !strconcat("TAG", !leaf_classname)

Or less elegantly if the derived class can name itself symbolically:

class BASE<string leaf_classname, dag oops, dag iops, list<dag> pattern>
...
def DERIVED : BASE<!self_classname, (outs ...

Currently I'm repeating the derived class/def name as a string which is a
bit non-DRY; it's a minor pain but would be nice to avoid if there's some
approach to those fantasy !leaf_classname/!self_classname operations.
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