[mlir][utils] Update generate-test-checks.py (use SSA names) (#136819)

This patch updates generate-test-checks.py to preserve original SSA
names (capitalized) when generating LIT variable names for function
arguments (i.e. for `CHECK-SAME` lines). This improves readability and
helps maintain consistency between the input MLIR and the expected
FileCheck/LIT output.

For example, given the following function:

```mlir
func.func @example(
    %input: memref<4x6x3xf32>,
    %filter: memref<1x3x8xf32>,
    %output: memref<4x2x8xf32>) {

  linalg.conv_1d_nwc_wcf
    {dilations = dense<1> : tensor<1xi64>, strides = dense<3> : tensor<1xi64>}
    ins(%input, %filter : memref<4x6x3xf32>, memref<1x3x8xf32>)
    outs(%output : memref<4x2x8xf32>)

  return
}
```

The generated output becomes:

```mlir
// CHECK-LABEL: func.func @conv1d_nwc_4x2x8_memref(
// CHECK-SAME:      %[[INPUT:.*]]: memref<4x6x3xf32>,
// CHECK-SAME:      %[[FILTER:.*]]: memref<1x3x8xf32>,
// CHECK-SAME:      %[[OUTPUT:.*]]: memref<4x2x8xf32>) {
// CHECK:         linalg.conv_1d_nwc_wcf
// CHECK:           {dilations = dense<1> : tensor<1xi64>, strides = dense<3> : tensor<1xi64>}
// CHECK:           ins(%[[INPUT]], %[[FILTER]] : memref<4x6x3xf32>, memref<1x3x8xf32>)
// CHECK:           outs(%[[OUTPUT]] : memref<4x2x8xf32>)
// CHECK:         return
// CHECK:       }
```

By contrast, the current version of the script would generate:

```mlir
// CHECK-LABEL: func.func @conv1d_nwc_4x2x8_memref(
// CHECK-SAME:      %[[VAL_0:.*]]: memref<4x6x3xf32>,
// CHECK-SAME:      %[[VAL_1:.*]]: memref<1x3x8xf32>,
// CHECK-SAME:      %[[VAL_2:.*]]: memref<4x2x8xf32>) {
// CHECK:         linalg.conv_1d_nwc_wcf
// CHECK:           {dilations = dense<1> : tensor<1xi64>, strides = dense<3> : tensor<1xi64>}
// CHECK:           ins(%[[VAL_0]], %[[VAL_1]] : memref<4x6x3xf32>, memref<1x3x8xf32>)
// CHECK:           outs(%[[VAL_2]] : memref<4x2x8xf32>)
// CHECK:         return
// CHECK:       }
```

0 files changed, 0 insertions, 0 deletions