Merging r340125:

Merging r340125:

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r340125 | lhames | 2018-08-18 11:38:37 -0700 (Sat, 18 Aug 2018) | 6 lines

[RuntimeDyld] Fix a bug in RuntimeDyld::loadObjectImpl that was over-allocating
space for common symbols.

Patch by Dmitry Sidorov. Thanks Dmitry!

Differential revision: https://reviews.llvm.org/D50240
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_70@348555 91177308-0d34-0410-b5e6-96231b3b80d8