[lld] [LLD][COFF] Use EC symbol table for output DEF file on ARM64X (PR #125531)

[Martin Storsjö via llvm-commits]

https://github.com/mstorsjo commented:

Sounds reasonable overall; yes, let's not invent new options until we have a known case where we'd need it, and until we have it all settled how we otherwise want things to behave in a mingw context.

The code looks good, but I've got one question on the testcase.

https://github.com/llvm/llvm-project/pull/125531