[llvm] [TextAPI] Track RPaths in the order its provided via command line. (PR #131665)

[Cyndy Ishida via llvm-commits]

cyndyishida wrote:

> Is there a test that verifies the rpaths order is preserved?

Yes, in `clang-installapi`'s `rpath.test` the llvm-readtapi change validates that the order.

https://github.com/llvm/llvm-project/pull/131665