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comparator for std::sort() Our debug comparator assumed that the comparator it wraps would always accepts the values by const ref. This isn't required by the standard. This patch makes our __debug_less comparator forward the constness. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@355752 91177308-0d34-0410-b5e6-96231b3b80d8