[ELF] - keep alive all non-text sections referenced by .eh_frame

Patch implements one of suggestions from Rafael Ávila de Espíndola,
to fix segfault after section that contains personality being
garbage collected.

Suggestion was just to keep alive all non executable sections
referenced by .eh_frame.

This fixes PR27529.

Differential revision: http://reviews.llvm.org/D19656

llvm-svn: 268228