[lld] [LLD] [COFF] Error out if the runtime pseudo relocation function is missing (PR #88573)

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

Thanks for the input! I changed this to be a hard error now - adjusting both commit message and the tone of the output message slightly.

https://github.com/llvm/llvm-project/pull/88573