[llvm][NFC] A start at cleaning up zero byte files that should have been removed (#74404)

GitOrigin-RevId: 12ed2c90a105f29b9b2f6056d936f47534d31624
diff --git a/include/polly/CodeGen/CodegenCleanup.h b/include/polly/CodeGen/CodegenCleanup.h
deleted file mode 100644
index e69de29..0000000
--- a/include/polly/CodeGen/CodegenCleanup.h
+++ /dev/null