[LV][LAA] Vectorize loop invariant values stored into loop invariant address
We are overly conservative in loop vectorizer with respect to stores to loop
More details in https://bugs.llvm.org/show_bug.cgi?id=38546
This is the first part of the fix where we start with vectorizing loop invariant
values to loop invariant addresses.
This also includes changes to ORE for stores to invariant address.
Reviewers: anemet, Ayal, mkuper, mssimpso
Differential Revision: https://reviews.llvm.org/D50665