[PATCH] Introduce GlobalAlias::mayBeResolved().

[Rafael Ávila de Espíndola]

  I don' think "may" is the best term in here. Resolving an alias should be legal. It only causes problem in very special cases (like the got not being available yet ). The question is if it is profitable to do so.

  In the globalopt case it is not. I have not investigated what the other passes are doing.

http://llvm-reviews.chandlerc.com/D606