[PATCH] MC: For variable symbols, maintain MCSymbol::Section as a cache.

[Rafael Ávila de Espíndola]

LGTM

PR19582 is one of the most fundamental bugs we have in MC at the moment.

We don't decide if a symbol is global, weak, hidden, etc when it is created. The only thing we try and fail to decide is if it is defined. This change makes the variable representation a lot saner by removing the notion of "setting the section" of variable.


http://reviews.llvm.org/D8798

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