[JS/WebGPU] fix an error in Clip (microsoft#18799)

### Description
<!-- Describe your changes. -->
Check whether the min/max inputs are provided and use default values if not provided.


### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->

js/web/lib/wasm/jsep/webgpu/ops/common.ts

@@ -772,14 +772,14 @@ class ShaderHelperImpl implements ShaderHelper {
     const is1DimensionDispatch = this.normalizedDispatchGroup[1] === 1 && this.normalizedDispatchGroup[2] === 1;
     const paramList = is1DimensionDispatch ? `@builtin(global_invocation_id) global_id : vec3<u32>,
     @builtin(local_invocation_id) local_id : vec3<u32>` :
-                                             `@builtin(local_invocation_index) local_index : u32,
+                                             `@builtin(local_invocation_index) local_idx : u32,
     @builtin(workgroup_id) workgroup_id : vec3<u32>,
     @builtin(num_workgroups) num_workgroups : vec3<u32>`;
     const globalIdxDefinition = is1DimensionDispatch ?
-        'let global_idx = global_id.x;' :
+        'let global_idx = global_id.x; let local_idx = local_id.x;' :
         `let global_idx = (workgroup_id.z * num_workgroups[0] * num_workgroups[1] +
           workgroup_id.y * num_workgroups[0] + workgroup_id.x) * ${
-            workgroupSizeX * workgroupSizeY * workgroupSizeZ}u + local_index;`;
+            workgroupSizeX * workgroupSizeY * workgroupSizeZ}u + local_idx;`;
 
     return `@compute @workgroup_size(${workgroupSizeX}, ${workgroupSizeY}, ${workgroupSizeZ})
   fn main(${paramList}) {

js/web/lib/wasm/jsep/webgpu/ops/gemm.ts

@@ -97,8 +97,8 @@ const createGemmProgramInfo = (inputs: readonly TensorView[], attributes: GemmAt
   ${shaderHelper.mainStart()}
     ${shaderHelper.guardAgainstOutOfBoundsWorkgroupSizes(outputSize)}
 
-    let m = global_id.x / N;
-    let n = global_id.x % N;
+    let m = global_idx / N;
+    let n = global_idx % N;
 
     var value = ${dataType}(0);
     for (var k: u32 = 0u; k<${K}u; k++) {
@@ -107,7 +107,7 @@ const createGemmProgramInfo = (inputs: readonly TensorView[], attributes: GemmAt
 
     ${calculateAlpha}
     ${calculateC}
-    output[global_id.x] = value;
+    output[global_idx] = value;
 
   }`;
   return {

js/web/lib/wasm/jsep/webgpu/ops/reduce-shared.ts

@@ -141,7 +141,6 @@ export const createReduceSharedProgramInfo =
           return ((a - 1u) / b + 1u);
          }
          ${shaderHelper.mainStart(workgroupSize)}
-          let local_idx = local_id.x;
 
           let outputIndex = global_idx / ${workgroupSize};
           let offset = outputIndex * uniforms.reduceSize;

js/web/lib/wasm/jsep/webgpu/ops/softmax.ts

@@ -73,8 +73,8 @@ const createSoftmaxProgramInfo = (input: TensorView, attributes: SoftmaxAttribut
       }
       ${shaderHelper.registerUniform('packedCols', 'i32').declareVariables(x, output)}
       ${shaderHelper.mainStart()}
-        let gindex = i32(global_id.x);
-        let lindex = i32(local_id.x);
+        let gindex = i32(global_idx);
+        let lindex = i32(local_idx);
         const wg = ${WG};
         let row = gindex / wg;
         let cols = uniforms.packedCols;

js/web/lib/wasm/jsep/webgpu/ops/unary-op.ts

@@ -125,8 +125,8 @@ export interface ClipAttributes extends AttributeWithCacheKey {
 }
 
 const generateClipAttributesFromInputs = (inputs: readonly TensorView[]): ClipAttributes => {
-  const min = (inputs.length >= 2) ? inputs[1].getFloat32Array()[0] : MIN_CLIP;
-  const max = (inputs.length >= 3) ? inputs[2].getFloat32Array()[0] : MAX_CLIP;
+  const min = (inputs.length >= 2 && inputs[1].data !== 0) ? inputs[1].getFloat32Array()[0] : MIN_CLIP;
+  const max = (inputs.length >= 3 && inputs[2].data !== 0) ? inputs[2].getFloat32Array()[0] : MAX_CLIP;
   return createAttributeWithCacheKey({min, max});
 };