[llvm] [llvm-dlltool] Use EXPORTAS name type for renamed imports on ARM64EC. (PR #99346)

[Martin Storsjö via llvm-commits]

https://github.com/mstorsjo commented:

The functional change LGTM, but one comment on the test and one unrelated discussion point.

https://github.com/llvm/llvm-project/pull/99346