[ELF] Handle multiple discontiguous .note sections

There could be multiple discontiguous output .note sections in which
case we need to put these into separate PT_NOTE segments rather then
placing them into a single segment. Where possible, we could reorder
the input sections to make sure that all .note are layed out next to
each other to avoid creation multiple PT_NOTE segments, but even in
that case, it's still possible to construct a discontiguous case e.g.
by using a linker script.

Differential Revision: https://reviews.llvm.org/D29364

llvm-svn: 293811

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