[lld] [LLD][COFF] Separate EC and native exports for ARM64X (PR #123652)

[Jacek Caban via llvm-commits]

cjacek wrote:

Depends on #123651.

This is the main refactoring for ARM64X export support. The observable effect in tests is that EC exports are no longer exported from the native view. For the EC view, a separate export table will be needed, with ARM64X relocations modifying it. I plan to submit that next.

https://github.com/llvm/llvm-project/pull/123652