[SLP] Don't vectorize loads of non-packed types (like i1, i2).

[SLP] Don't vectorize loads of non-packed types (like i1, i2).

Summary:
Given an array of i2 elements, 4 consecutive scalar loads will be lowered to
i8-sized loads and thus will access 4 consecutive bytes in memory. If we
vectorize these loads into a single <4 x i2> load, it'll access only 1 byte in
memory. Hence, we should prohibit vectorization in such cases.

PS: Initial patch was proposed by Arnold.

Reviewers: aschwaighofer, nadav, hfinkel

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D13277

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248943 91177308-0d34-0410-b5e6-96231b3b80d8