Updates the Bazel configuration for
https://github.com/llvm/llvm-project/commit/ee7d20e84675. We need to
drop the dependency from llvm-tblgen to avoid a dependency cycle:
.-> @llvm-project//llvm:llvm-tblgen | @llvm-project//llvm:tblgen | @llvm-project//llvm:MC | @llvm-project//llvm:ProfileData | @llvm-project//llvm:Core | @llvm-project//llvm:attributes_gen | @llvm-project//llvm:include/llvm/IR/Attributes.inc | @llvm-project//llvm:attributes_gen__gen_attrs_genrule `-- @llvm-project//llvm:llvm-tblgen
It appears this dep was not strictly necessary though. TableGen uses MC
headers but it can get those through Support, which also exports MC
headers due to layering issues.