WASHINGTON — A Supreme Court deeply split over abortion wrestled Wednesday with widely replicated Texas regulations that could drastically cut the number of abortion clinics in the state. As ever, Justice Anthony Kennedy appeared to hold the outcome in his hands on a court operating with eight justices since the death of Justice Antonin Scalia. The court's most significant abortion case since the early 1990s crackled with intensity during 85 minutes of pointed questions from liberal and conservative justices that suggested little common ground in resolving the clinics' claim that the regulations are medically unnecessary and unconstitutionally limit a woman's right to an abortion.