[lld] [lld][ELF]Emit warning when both scripts are specified (PR #163497)

[Sam Elliott via llvm-commits]

lenary wrote:

I believe the intention of `--default-script` is to be used by e.g. toolchain configs, so that users can override the script if they have one of their own. In this usecase a warning would not be wanted, because the options are working as expected.

My understanding could be wrong, I'll defer to MaskRay if he has other opinions.



https://github.com/llvm/llvm-project/pull/163497