[mlir][utils] Update generate-test-checks.py (#136757)

At the moment, the `CHECK-SAME` lines generated by
"generate-test-checks.py" (i.e. check-lines that correspond to the
preceeding `CHECK-LABEL` line) are indented to match the label length.
For example,

```mlir
func.func @batch_reduce_matmul_bcast_k_to_fill_missing_dims_A(%arg0: memref<5xf32>, %arg1: memref<2x5x7xf32>, %arg2: memref<3x7xf32>) {
  linalg.batch_reduce_matmul indexing_maps = (...)
}
```

will lead to the following:

```mlir
// CHECK-LABEL:   func.func @batch_reduce_matmul_bcast_k_to_fill_missing_dims_A(
// CHECK-SAME:                                                                  %[[VAL_0:[0-9]+|[a-zA-Z$._-][a-zA-Z0-9$._-]*]]: memref<5xf32>,
// CHECK-SAME:                                                                  %[[VAL_1:[0-9]+|[a-zA-Z$._-][a-zA-Z0-9$._-]*]]: memref<2x5x7xf32>,
// CHECK-SAME:                                                                  %[[VAL_2:[0-9]+|[a-zA-Z$._-][a-zA-Z0-9$._-]*]]: memref<3x7xf32>) {
// CHECK:           linalg.batch_reduce_matmul indexing_maps = (...)
```

This indentation is unnecasarilly deep. With this change, for labales
that are longer than 20 chars, the indentation is trimmed to 4 spaces:
```mlir
// CHECK-LABEL:   func.func @batch_reduce_matmul_bcast_k_to_fill_missing_dims_A(
// CHECK-SAME:        %[[VAL_0:[0-9]+|[a-zA-Z$._-][a-zA-Z0-9$._-]*]]: memref<5xf32>,
// CHECK-SAME:        %[[VAL_1:[0-9]+|[a-zA-Z$._-][a-zA-Z0-9$._-]*]]: memref<2x5x7xf32>,
// CHECK-SAME:        %[[VAL_2:[0-9]+|[a-zA-Z$._-][a-zA-Z0-9$._-]*]]: memref<3x7xf32>) {
// CHECK:           linalg.batch_reduce_matmul indexing_maps = (...)
```

0 files changed, 0 insertions, 0 deletions