Fix Pipeline Dump Error when Handling Immutable Sampler
Fix Pipeline Dump Error when Handling Immutable Sampler

 - Use correct index when dumping immutable value

googlestadia/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,googlestadia/llpc,googlestadia/llpc