Correct expectation for shift equal to bit width (#3868)

It is a shader/pipeline-creation error if the number of bits to shift is greater than *or equal* to the bit width of the value to shift. This change corrects the expectations for the equals case, and adds a function reference to the pipeline subcase so it isn't stripped out.

These tests will pass in Dawn following: https://dawn-review.googlesource.com/c/dawn/+/199075

src/webgpu/shader/validation/expression/binary/bitwise_shift.spec.ts

@@ -298,14 +298,14 @@ g.test('shift_right_abstract')
   });
 
 g.test('partial_eval_errors')
-  .desc('Tests partial evaluation errors for left shift')
+  .desc('Tests partial evaluation errors for left and right shift')
   .params(u =>
     u
       .combine('op', ['<<', '>>'] as const)
       .combine('type', ['i32', 'u32'] as const)
       .beginSubcases()
       .combine('stage', ['shader', 'pipeline'] as const)
-      .combine('value', [32, 33, 64] as const)
+      .combine('value', [31, 32, 33, 64] as const)
   )
   .fn(t => {
     const u32 = Type.u32;
@@ -315,12 +315,12 @@ g.test('partial_eval_errors')
     }
     const wgsl = `
 override o = 0u;
-fn foo() {
+fn foo() -> ${t.params.type} {
   var v : ${t.params.type} = 0;
-  let tmp = v ${t.params.op} ${rhs};
+  return v ${t.params.op} ${rhs};
 }`;
 
-    const expect = t.params.value <= 32;
+    const expect = t.params.value < 32;
     if (t.params.stage === 'shader') {
       t.expectCompileResult(expect, wgsl);
     } else {
@@ -330,7 +330,7 @@ fn foo() {
         expectedResult: expect,
         code: wgsl,
         constants,
-        reference: ['o'],
+        reference: ['o', 'foo()'],
       });
     }
   });