[js/webgpu] more fixes for access above 2GB (microsoft#19065)

when jsep calls javascript with an index to HEAP8 or HEAP32 the index is
negative when the heap is above 2GB, even if we pass it as uint32_t it
remains negative. So in javascript use >>> 0 to make it unsigned.

web/lib/wasm/jsep/init.ts

@@ -170,7 +170,7 @@ export const init = async(module: OrtWasmModule, env: Env, gpuAdapter: GPUAdapte
           backend.memcpy(src, dst);
         } else {
           LOG_DEBUG('verbose', () => `[WebGPU] jsepCopyCpuToGpu: dataOffset=${src}, gpuDataId=${dst}, size=${size}`);
-          const data = module.HEAPU8.subarray(src, src + size);
+          const data = module.HEAPU8.subarray(src >>> 0, (src >>> 0) + size);
           backend.upload(dst, data);
         }
       },
@@ -182,7 +182,8 @@ export const init = async(module: OrtWasmModule, env: Env, gpuAdapter: GPUAdapte
                 'verbose',
                 () => `[WebGPU] jsepCopyGpuToCpu: gpuDataId=${gpuDataId}, dataOffset=${dataOffset}, size=${size}`);
 
-            await backend.download(gpuDataId, () => module.HEAPU8.subarray(dataOffset, dataOffset + size));
+            await backend.download(
+                gpuDataId, () => module.HEAPU8.subarray(dataOffset >>> 0, (dataOffset >>> 0) + size));
           },
 
       // jsepCreateKernel