[X86] Add some comments about when some X86 intrinsic autoupgrade code was added.

Someday we'd like to remove old autoupgrade code so it helps to annotate how long its been there so we don't have to go digging through commit history.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@348728 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed