[SCEV] Remove unused function; NFC

Moreover, I've never seen globally scoped `static inline` functions
elsewhere in LLVM, so this pattern is unusual if not unidiomatic.

llvm-svn: 271155

llvm/include/llvm/Analysis/ScalarEvolutionExpressions.h

@@ -680,13 +680,6 @@ namespace llvm {
   private:
     LoopToScevMapT ⤅
   };
-
-/// Applies the Map (Loop -> SCEV) to the given Scev.
-static inline const SCEV *apply(const SCEV *Scev, LoopToScevMapT &Map,
-                                ScalarEvolution &SE) {
-  return SCEVLoopAddRecRewriter::rewrite(Scev, Map, SE);
-}
-
 }
 
 #endif