Update on "add module level benchmark for gemma3 model"

This diff adds a module-level benchmark for the GEMMA3 model.
Also introduce mutlmodal_benchmark.cpp to replace original voxtral_runner.cpp for benchmarking both gemma3 and voxtral model in module level.

Differential Revision: [D84958564](https://our.internmc.facebook.com/intern/diff/D84958564/)

[ghstack-poisoned]

Author: Gasoonjia

backends/cuda/runtime/shims/memory.cpp

@@ -234,10 +234,9 @@ AOTITorchError aoti_torch_empty_strided(
     }
     // For each dimension, add stride[i] * (size[i] - 1)
     // This gives us the maximum offset in that dimension
-    int64_t stride_i = (strides_ptr != nullptr) ? strides_ptr[i] : 0;
+    int64_t stride_i = (strides_ptr != nullptr) ? strides_ptr[i] : 1;
     if (strides_ptr == nullptr) {
       // Calculate contiguous stride if not provided
-      stride_i = 1;
       for (int64_t j = i + 1; j < ndim; j++) {
         stride_i *= sizes_ptr[j];
       }