docs/Passes: fix some typos

Patch by Yacine Belkadi.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182197 91177308-0d34-0410-b5e6-96231b3b80d8
LoopVectorize: Handle single edge PHIs

We might encouter single edge PHIs - handle them with an identity select.

Fixes PR15990.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182199 91177308-0d34-0410-b5e6-96231b3b80d8