[clang] [llvm] [z/OS] treat text files as text files so auto-conversion is done (PR #90128)

[Sean Perry via cfe-commits]

perry-ca wrote:

> We don't normally commit in clang-format with a unit test

I assume you mean "without a unit test".  In this case the unit test is the existing test cases.  Some fail on z/OS because the files are not read in as text.  It's not really possible to detect this issue on other platforms.  I can't think of a new unit test that wouldn't duplicate what we already have.

https://github.com/llvm/llvm-project/pull/90128