Use ArrayRef instead of deep copies of CompactUnwindEntries.  NFC.
Use ArrayRef instead of deep copies of CompactUnwindEntries.  NFC.

We have a vector of all of the compact unwind entries anyway, and
its live as long as we need it to be.  So instead of copying from that
vector to another, just take references to the range of the original vector
we need for each compact unwind page.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@260437 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld