Add 'operator==' for 'basic_collection_iterator'

[Alexey Denisov via llvm-commits]

Patch adds ‘operator==‘ implementation for ‘basic_collection_iterator’

Motivation:

Swift compiler uses workaround since 'operator==‘ is not implemented.

Driver.cpp:220

  if (!(seqI != seqE))
    return true;



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AlexDenisov
Software Engineer, http://lowlevelbits.org

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