[bazel] Clean up unused exported files

[thevinster]

Some minor cleanup to the bazel files. These exported files are not being referenced anymore in the tree, afaict, so let's clean them up. Additionally, moved one of the filegroup targets higher to be consistent with other filegroup usages where it's defined before first usage.

[pranavk]

This is causing problems in bazel build:

ERROR: /var/lib/buildkite-agent/.cache/bazel/_bazel_buildkite-agent/3f9470ef82c49ef29515926500bf249a/external/llvm-project/lldb/BUILD.bazel:196:8: in genrule rule @@llvm-project//lldb:lldb-sbapi-dwarf-enums: target '@@llvm-project//llvm:include/llvm/BinaryFormat/Dwarf.def' is not visible from target '@@llvm-project//lldb:lldb-sbapi-dwarf-enums'. Check the visibility declaration of the former target if you think the dependency is legitimate. To set the visibility of that source file target, use the exports_files() function

[thevinster]

Sorry about the breakages. I was almost sure that this wouldn't break things, and I failed to see it being used in lldb. Thanks for fixing!

[rupprecht]

Sorry for not getting to this review earlier. I would have approved it though. Thanks @pranavk for the build fix!

Files often end up in exports_files because some other package needs it, and I'd wager it's often the case due to uses only outside of the LLVM tree. So removing things from exports_files just because there are no in tree uses is often going to break things.

That said, it's trivial to just add them back, preferably w/ a comment explaining that it's needed outside of the tree, so removing entries LGTM.

[pranavk]

yeah, no worries. this one was easy to fix.