[SLPVectorizer] Get rid of IndexQueue array from vectorizeStores. NFCI.

Indices are checked as they are generated. No need to fill the whole array of indices.

Differential Revision: https://reviews.llvm.org/D57144

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@352839 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed