LLVMCodegen: use C++ interface to isl

Author: Sven Verdoolaege

src/core/polyhedral/codegen_llvm.cc

@@ -481,7 +481,7 @@ class LLVMCodegen {
         llvm::BasicBlock::Create(llvmCtx, "loop_latch", function);
     auto* loopExitBB = llvm::BasicBlock::Create(llvmCtx, "loop_exit", function);
 
-    bool parallel = isl_ast_node_for_is_coincident(node.get());
+    bool parallel = node.is_coincident();
     llvm::Value* SyncRegion = nullptr;
 
 #ifdef TAPIR_VERSION_MAJOR