Simplify DWARFUnit::m_die_array swap() to use shrink_to_fit()
Simplify DWARFUnit::m_die_array swap() to use shrink_to_fit()

rL145086 introduced m_die_array.shrink_to_fit() implemented by
exact_size_die_array.swap, it was before LLVM became written in C++11.

Differential revision: https://reviews.llvm.org/D47492


git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@333636 91177308-0d34-0410-b5e6-96231b3b80d8

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