Merging r339166:

Merging r339166:
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r339166 | abataev | 2018-08-07 21:21:05 +0200 (Tue, 07 Aug 2018) | 12 lines

[SLP] Fix insert point for reused extract instructions.

Summary:
Reworked the previously committed patch to insert shuffles for reused
extract element instructions in the correct position. Previous logic was
incorrect, and might lead to the crash with PHIs and EH instructions.

Reviewers: efriedma, javed.absar

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D50143
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_70@339853 91177308-0d34-0410-b5e6-96231b3b80d8