[ELF] - Recommit r326892,r326893 "[ELF] - Report LMA region overflows."

With fix: add missing "RUN:" prefix to test case.

Original commit message:
We do not report LMA region overflows currently.
Both GNU linkers do that. The patch implements it.

Differential revision: https://reviews.llvm.org/D44094

llvm-svn: 326895