[llvm] [bazel] Replace gentbl with gentbl_cc_library (PR #124996)

[Aaron Siddhartha Mondal via llvm-commits]

https://github.com/aaronmondal approved this pull request.

We should probably aim to remove the `tblgen` macro entirely at some point (in favor of a tblgen_toolchain + rules) and this moves us towards that :+1:

https://github.com/llvm/llvm-project/pull/124996