Update structured references to the license to the new license.

Since these are intended to be short and succinct, I've used the SPDX
full name. It's human readable, but formally agreed upon and will be
part of the SPDX spec for licenses.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351649 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed