Support move to/from segment register.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214234 91177308-0d34-0410-b5e6-96231b3b80d8
llvm-profdata: Clean up and reorganize some tests

This moves some tests around to make it clearer what's being tested,
and adds very rudimentary comment syntax to the text input format to
make specifying this kind of test a little bit simpler.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214235 91177308-0d34-0410-b5e6-96231b3b80d8
Fix typo in alias: DSIR -> DSISR


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214238 91177308-0d34-0410-b5e6-96231b3b80d8