minor #3532 Implement Tokens::findOppositeBlockEdge (ntzm)
minor #3532 Implement Tokens::findOppositeBlockEdge (ntzm)

This PR was squashed before being merged into the 2.2 branch (closes #3532).

Discussion
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Implement Tokens::findOppositeBlockEdge

Ref: https://github.com/FriendsOfPHP/PHP-CS-Fixer/pull/3527#discussion_r167798841

Commits
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7eb51469 Implement Tokens::findOppositeBlockEdge

Slamdunk/PHP-CS-Fixer,FriendsOfPHP/PHP-CS-Fixer,GrahamCampbell/PHP-CS-Fixer,gharlan/PHP-CS-Fixer,SpacePossum/PHP-CS-Fixer,SpacePossum/PHP-CS-Fixer,Slamdunk/PHP-CS-Fixer,kubawerlos/PHP-CS-Fixer,keradus/PHP-CS-Fixer,keradus/PHP-CS-Fixer,kubawerlos/PHP-CS-Fixer,GrahamCampbell/PHP-CS-Fixer,FriendsOfPHP/PHP-CS-Fixer,gharlan/PHP-CS-Fixer