[llvm] [NFC][BOLT] clean up unused option '--cu-processing-batch-size' (PR #204515)

[via llvm-commits]

Thrrreeee wrote:

> I'm leaning more towards printing a deprecation message in case the user specify this option, and proceeding anyway.

The option description has now been changed to "Now it is unused".This option seems unnecessary in the test case now, so we need to remove this option from testcases.



https://github.com/llvm/llvm-project/pull/204515