Update the copyright coredits -- Happy new year 2013!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171342 91177308-0d34-0410-b5e6-96231b3b80d8
Simplify vector splat code. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171350 91177308-0d34-0410-b5e6-96231b3b80d8
Convert an if that never happens to an assert.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171354 91177308-0d34-0410-b5e6-96231b3b80d8