[ELF] - Fix (partial) for bug 28843 - Make sure we handle options with opposing meanings.

As stated in PR28843:

we should handle command lines with

-target1-rel -target1-abs
--demangle --no-demangle
Patch implements this for specified options.
There are probably other conflicting options can exist,
so fix is called "partial".

Differential revision: https://reviews.llvm.org/D23867

llvm-svn: 280211