Merging r249854:

Merging r249854:

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r249854 | kfischer | 2015-10-09 13:24:54 -0400 (Fri, 09 Oct 2015) | 11 lines

Clear SectionSymbols in MCContext::Reset

This was just forgotten when SectionSymbols was introduced and could cause
corruption if the MCContext was reused after Reset.

Reviewers: rafael

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D13547

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_37@252802 91177308-0d34-0410-b5e6-96231b3b80d8