[llvm] [llvm] Fixed Demangle OutputBuffer (PR #138564)

[Michael Buch via llvm-commits]

Michael137 wrote:

Ah this was failing in the new test I added. I guess we never previously called `prepend` with an empty `string_view` in our demangling test-suite. Are we sure we want to now support that use-case? . Also, we need to make the change on the libcxxabi side too

https://github.com/llvm/llvm-project/pull/138564