Merging r245365 and r245369:

Merging r245365 and r245369:
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r245365 | majnemer | 2015-08-18 15:07:25 -0700 (Tue, 18 Aug 2015) | 4 lines

[InstSimplify] Don't assume getAggregateElement will succeed

It isn't always possible to get a value from getAggregateElement.
This fixes PR24488.
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r245369 | majnemer | 2015-08-18 15:18:22 -0700 (Tue, 18 Aug 2015) | 3 lines

[InstSimplify] Remove unused variable

No functionality change is intended.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_37@245572 91177308-0d34-0410-b5e6-96231b3b80d8