[llvm] [VectorCombine] Fix duplicate freeze scheduling for shared indexes (PR #213461)

[via llvm-commits]

================

----------------
ParkHanbum wrote:

I think this test case would be better placed in `load-extractelement-scalarization.ll`. There are separate versions of this file for X86 and AArch64. but not sure. waiting for answer of @RKSimon 

https://github.com/llvm/llvm-project/pull/213461