fixup: Use the clearer NON-DEFAULT check-prefix

Author: abulavin

mlir/test/Conversion/VectorToLLVM/test-serialisable.mlir

@@ -5,7 +5,7 @@
 // RUN: mlir-opt --convert-vector-to-llvm --dump-pass-pipeline %s 2>&1 | FileCheck %s --check-prefix=DEFAULT
 
 // RUN: mlir-opt --convert-vector-to-llvm='vector-contract-lowering=matmul vector-transpose-lowering=flat' \
-// RUN:          --dump-pass-pipeline 2>&1 | FileCheck %s --check-prefix=CHANGED
+// RUN:          --dump-pass-pipeline 2>&1 | FileCheck %s --check-prefix=NON-DEFAULT
 
 // CHECK: builtin.module(
 // CHECK-SAME: convert-vector-to-llvm{
@@ -17,5 +17,5 @@
 // CHECK-SAME: reassociate-fp-reductions={{[aA-zZ0-9]+}}
 // DEFAULT: vector-contract-lowering=dot
 // DEFAULT: vector-transpose-lowering=eltwise
-// CHANGED: vector-contract-lowering=matmul
-// CHANGED: vector-transpose-lowering=flat
+// NON-DEFAULT: vector-contract-lowering=matmul
+// NON-DEFAULT: vector-transpose-lowering=flat