[PPC][NFC] Renaming things with 'xxinsert' moniker to 'vecinsert' to make it more general.

Commit on behalf of Graham Yiu (gyiu@ca.ibm.com)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312547 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed