Revert 148902 which was part of 148901 which was reverted in r148906.

Original log:
 use the new ConstantVector::getSplat method where it makes sense.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@148907 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed