[Loop vectorizer] Simplified GEP cloning. NFC.
[Loop vectorizer] Simplified GEP cloning. NFC.

Simplified GEP cloning in vectorizeMemoryInstruction().
Added an assertion that checks consecutive GEP, which should have only one loop-variant operand.

Differential Revision: https://reviews.llvm.org/D24557



git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@281851 91177308-0d34-0410-b5e6-96231b3b80d8

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