Update the file headers used throughout the ABI testsuite to reflect the

new license. Separating these updates from the rest of the testsuite due
to the size of files and impact this has on the system.

git-svn-id: https://llvm.org/svn/llvm-project/test-suite/trunk@351676 91177308-0d34-0410-b5e6-96231b3b80d8

Author: chandlerc