Depends on:
* https://github.com/llvm/llvm-project/pull/168382
As of recent, LLVM includes the bit-size as a `DW_AT_bit_size` (and as
part of `DW_AT_name`) of `_BitInt`s in DWARF. This allows us to mark
`_BitInt`s as "reconstitutable" when compiling with
`-gsimple-template-names`. We still only omit template parameters that
are `<= 64` bit wide. So support `_BitInt`s larger than 64 bits is not
part of this patch.
db1e73ea6d