Skip fine derivative tests in compatibility mode (#4504)

`dpdxFine`, `dpdyFine`, and `fwidthFine` are not supported in
compatibility mode.

Author: greggman

src/webgpu/shader/execution/expression/call/builtin/dpdxFine.spec.ts

@@ -24,6 +24,7 @@ g.test('f32')
       .combine('non_uniform_discard', [false, true])
   )
   .fn(async t => {
+    t.skipIf(t.isCompatibility, `${builtin} not supported in compatibility mode`);
     const cases = await d.get('scalar');
     runDerivativeTest(t, cases, builtin, t.params.non_uniform_discard, t.params.vectorize);
   });

src/webgpu/shader/execution/expression/call/builtin/dpdyFine.spec.ts

@@ -24,6 +24,7 @@ g.test('f32')
       .combine('non_uniform_discard', [false, true])
   )
   .fn(async t => {
+    t.skipIf(t.isCompatibility, `${builtin} not supported in compatibility mode`);
     const cases = await d.get('scalar');
     runDerivativeTest(t, cases, builtin, t.params.non_uniform_discard, t.params.vectorize);
   });

src/webgpu/shader/execution/expression/call/builtin/fwidthFine.spec.ts

@@ -24,6 +24,7 @@ g.test('f32')
       .combine('non_uniform_discard', [false, true])
   )
   .fn(async t => {
+    t.skipIf(t.isCompatibility, `${builtin} not supported in compatibility mode`);
     const cases = await d.get('scalar');
     runFWidthTest(t, cases, builtin, t.params.non_uniform_discard, t.params.vectorize);
   });