[llvm] r233595 - MC: For variable symbols, maintain MCSymbol::Section as a cache.

[Duncan P. N. Exon Smith]

> On 2015-Apr-01, at 14:13, Peter Collingbourne <peter at pcc.me.uk> wrote:
> 
> Fair enough. Perhaps in this case i overassumed that Tim would be able to approve the mach-o changes.

Tim is perfectly capable of reviewing, but Jim had already raised a
concern.  Around here, you can't commit until everyone that's raised a
concern signs off.