Update src/tint unittests to new @stage format.

This CL updates all of the Tint unittests to the new @stage shorter
syntax. This also updates the WGSL writer to emit the new short forms
instead of using the deprecated form.

Bug: tint:1503
Change-Id: I8c49e5319a19cccb5b4b5078f3ab39c50f31a9a8
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/92483
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>

test/tint/expressions/binary/mod_by_zero/by_expression/scalar-scalar/f32.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
     var a = 1.;
     var b = 0.;

test/tint/expressions/binary/mod_by_zero/by_expression/scalar-scalar/f32.wgsl.expected.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
   var a = 1.0;
   var b = 0.0;

test/tint/expressions/binary/mod_by_zero/by_expression/scalar-scalar/i32.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
     var a = 1;
     var b = 0;

test/tint/expressions/binary/mod_by_zero/by_expression/scalar-scalar/i32.wgsl.expected.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
   var a = 1;
   var b = 0;

test/tint/expressions/binary/mod_by_zero/by_expression/scalar-scalar/u32.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
     var a = 1u;
     var b = 0u;

test/tint/expressions/binary/mod_by_zero/by_expression/scalar-scalar/u32.wgsl.expected.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
   var a = 1u;
   var b = 0u;

test/tint/expressions/binary/mod_by_zero/by_expression/scalar-vec3/i32.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
     var a = 4;
     var b = vec3<i32>(0, 2, 0);

test/tint/expressions/binary/mod_by_zero/by_expression/scalar-vec3/i32.wgsl.expected.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
   var a = 4;
   var b = vec3<i32>(0, 2, 0);

test/tint/expressions/binary/mod_by_zero/by_expression/scalar-vec3/u32.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
     var a = 4u;
     var b = vec3<u32>(0u, 2u, 0u);

test/tint/expressions/binary/mod_by_zero/by_expression/scalar-vec3/u32.wgsl.expected.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
   var a = 4u;
   var b = vec3<u32>(0u, 2u, 0u);

test/tint/expressions/binary/mod_by_zero/by_expression/vec3-scalar/i32.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
     var a = vec3<i32>(1, 2, 3);
     var b = 0;

test/tint/expressions/binary/mod_by_zero/by_expression/vec3-scalar/i32.wgsl.expected.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
   var a = vec3<i32>(1, 2, 3);
   var b = 0;

test/tint/expressions/binary/mod_by_zero/by_expression/vec3-scalar/u32.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
     var a = vec3<u32>(1u, 2u, 3u);
     var b = 0u;

test/tint/expressions/binary/mod_by_zero/by_expression/vec3-scalar/u32.wgsl.expected.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
   var a = vec3<u32>(1u, 2u, 3u);
   var b = 0u;

test/tint/expressions/binary/mod_by_zero/by_expression/vec3-vec3/f32.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
     var a = vec3<f32>(1., 2., 3.);
     var b = vec3<f32>(0., 5., 0.);

test/tint/expressions/binary/mod_by_zero/by_expression/vec3-vec3/f32.wgsl.expected.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
   var a = vec3<f32>(1.0, 2.0, 3.0);
   var b = vec3<f32>(0.0, 5.0, 0.0);

test/tint/expressions/binary/mod_by_zero/by_expression/vec3-vec3/i32.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
     var a = vec3<i32>(1, 2, 3);
     var b = vec3<i32>(0, 5, 0);

test/tint/expressions/binary/mod_by_zero/by_expression/vec3-vec3/i32.wgsl.expected.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
   var a = vec3<i32>(1, 2, 3);
   var b = vec3<i32>(0, 5, 0);

test/tint/expressions/binary/mod_by_zero/by_expression/vec3-vec3/u32.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
     var a = vec3<u32>(1u, 2u, 3u);
     var b = vec3<u32>(0u, 5u, 0u);

test/tint/expressions/binary/mod_by_zero/by_expression/vec3-vec3/u32.wgsl.expected.wgsl

@@ -1,4 +1,4 @@
-@stage(compute) @workgroup_size(1)
+@compute @workgroup_size(1)
 fn f() {
   var a = vec3<u32>(1u, 2u, 3u);
   var b = vec3<u32>(0u, 5u, 0u);