Remove unnecessary definition of 'art::Split'

Bug: http://b/78352390

Fix duplicate symbol warning found with lld

Test: build with
https://android-review.googlesource.com/c/platform/art/+/669149 and
verify that the duplicate symbol warning is no longer generated.

Change-Id: Ie77d1bfaa84ec034ef9bc39dd63422d859e0f7c5
1 file changed