Merging r292624:

Merging r292624:
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r292624 | petarj | 2017-01-20 09:53:30 -0800 (Fri, 20 Jan 2017) | 9 lines

[mips] Fix debug information for __thread variable

This patch fixes debug information for __thread variable on Mips
using .dtprelword and .dtpreldword directives.

Patch by Aleksandar Beserminji.

Differential Revision: http://reviews.llvm.org/D28770

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_40@293664 91177308-0d34-0410-b5e6-96231b3b80d8