[SCEVValidator] Remove redundant visit.

SCEVAddRecExpr::getStart() is synonymous to SCEVAddRecExpr::getOperand(0)
which will be visited in the following loop anyway.

llvm-svn: 262375

polly/lib/Support/SCEVValidator.cpp

@@ -476,9 +476,6 @@ public:
   }
 
   bool visitAddRecExpr(const SCEVAddRecExpr *Expr) {
-    if (visit(Expr->getStart()))
-      return true;
-
     for (size_t i = 0; i < Expr->getNumOperands(); ++i)
       if (visit(Expr->getOperand(i)))
         return true;