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Revert "[ADT] Enable set_difference() to be used on StringSet"

Authored by vlad.tsyrklevich on Jun 7 2019, 11:34 AM.

Description

Revert "[ADT] Enable set_difference() to be used on StringSet"

This reverts commit 0bddef79019a23ab14fcdb27028e55e484674c88, it was
causing ASan failures on the sanitizer bots:
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fast/builds/32800

llvm-svn: 362823