collect2 always built?

[Joe Buck]

> This is not true of ELF targets; they only use collect2 for -frepo handling
> and demangling of error messages.

If someone has ELF and the latest GNU ld, is there ever a situation where
they would want to use -frepo?  (This question is intended for
implementers familiar with template instantiation details only).
It seems that all -frepo will do is take multiple passes to produce the
same executable that could have been produced without it in one pass.

Since GNU ld does demangling of error messages, it would seem that there
is no reason to use collect on Linux/ELF.