[LV] Fix PR34743 - handle casts that sink after interleaved loads

When ignoring a load that participates in an interleaved group, make sure to
move a cast that needs to sink after it.

Testcase derived from reproducer of PR34743.

Differential Revision: https://reviews.llvm.org/D38338


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@314986 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed