[DAGCombiner] Extending pattern detection for vector shuffle.

[DAGCombiner] Extending pattern detection for vector shuffle.

Summary:
If all the operands of a BUILD_VECTOR extract elements from same vector then split the
vector efficiently based on the maximum vector access index.

This will also fix PR 33784

Reviewers: zvi, delena, RKSimon, thakis

Reviewed By: RKSimon

Subscribers: chandlerc, eladcohen, llvm-commits

Differential Revision: https://reviews.llvm.org/D35788

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@311833 91177308-0d34-0410-b5e6-96231b3b80d8