Peter Collingbourne 07ee8d2fc1 MC: For variable symbols, maintain MCSymbol::Section as a cache.
This fixes the visibility of symbols in certain edge cases involving aliases
with multiple levels of indirection.

Fixes PR19582.

Differential Revision: http://reviews.llvm.org/D8586

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233595 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-30 20:41:21 +00:00
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