[llvm] [bazel] Update tblgen rules to support path-mapping (PR #158354)

[Jordan Rupprecht via llvm-commits]

rupprecht wrote:

> As a side effect this drops the genfiles_dir, but that has been the same
> as bin_dir for a long time so hopefully that's a no-op for folks.

It is, but the old behavior can be restored w/ some `--incompatible` flags. It's a trivial fix though: add `output_to_bindir = 1` to any genrule which generates a `.td` file. See #158669 for the one fix needed in LLVM for this.

https://github.com/llvm/llvm-project/pull/158354