wgsl: Replace [[decoration]] with @decoration

Deprecate the old syntax. Migrate everything to the new syntax.

Bug: tint:1382
Change-Id: Ide12b2e927b17dc93b9714c7049090864cc568d3
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/77260
Reviewed-by: James Price <jrprice@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: David Neto <dneto@google.com>
Commit-Queue: David Neto <dneto@google.com>

test/statements/assign/phony/addr_of_non_constructable.wgsl

@@ -2,9 +2,9 @@ struct S {
     arr : array<i32>;
 };
 
-[[binding(0), group(0)]] var<storage, read_write> s : S;
+@binding(0) @group(0) var<storage, read_write> s : S;
 
-[[stage(compute), workgroup_size(1)]]
+@stage(compute) @workgroup_size(1)
 fn main() {
     _ = &s;
 }

test/statements/assign/phony/addr_of_non_constructable.wgsl.expected.wgsl

@@ -2,9 +2,9 @@ struct S {
   arr : array<i32>;
 }
 
-[[binding(0), group(0)]] var<storage, read_write> s : S;
+@binding(0) @group(0) var<storage, read_write> s : S;
 
-[[stage(compute), workgroup_size(1)]]
+@stage(compute) @workgroup_size(1)
 fn main() {
   _ = &(s);
 }

test/statements/assign/phony/addr_of_runtime_array.wgsl

@@ -2,9 +2,9 @@ struct S {
     arr : array<i32>;
 };
 
-[[binding(0), group(0)]] var<storage, read_write> s : S;
+@binding(0) @group(0) var<storage, read_write> s : S;
 
-[[stage(compute), workgroup_size(1)]]
+@stage(compute) @workgroup_size(1)
 fn main() {
     _ = &s.arr;
 }

test/statements/assign/phony/addr_of_runtime_array.wgsl.expected.wgsl

@@ -2,9 +2,9 @@ struct S {
   arr : array<i32>;
 }
 
-[[binding(0), group(0)]] var<storage, read_write> s : S;
+@binding(0) @group(0) var<storage, read_write> s : S;
 
-[[stage(compute), workgroup_size(1)]]
+@stage(compute) @workgroup_size(1)
 fn main() {
   _ = &(s.arr);
 }

test/statements/assign/phony/call.wgsl

@@ -2,7 +2,7 @@ fn f(a: i32, b: i32, c: i32) -> i32 {
     return a * b + c;
 }
 
-[[stage(compute), workgroup_size(1)]]
+@stage(compute) @workgroup_size(1)
 fn main() {
     _ = f(1, 2, 3);
 }

test/statements/assign/phony/call.wgsl.expected.wgsl

@@ -2,7 +2,7 @@ fn f(a : i32, b : i32, c : i32) -> i32 {
   return ((a * b) + c);
 }
 
-[[stage(compute), workgroup_size(1)]]
+@stage(compute) @workgroup_size(1)
 fn main() {
   _ = f(1, 2, 3);
 }

test/statements/assign/phony/multiple_side_effects.wgsl

@@ -2,7 +2,7 @@ fn f(a: i32, b: i32, c: i32) -> i32 {
     return a * b + c;
 }
 
-[[stage(compute), workgroup_size(1)]]
+@stage(compute) @workgroup_size(1)
 fn main() {
     _ = f(1, 2, 3) + f(4, 5, 6) * f(7, f(8, 9, 10), 11);
 }

test/statements/assign/phony/multiple_side_effects.wgsl.expected.wgsl

@@ -2,7 +2,7 @@ fn f(a : i32, b : i32, c : i32) -> i32 {
   return ((a * b) + c);
 }
 
-[[stage(compute), workgroup_size(1)]]
+@stage(compute) @workgroup_size(1)
 fn main() {
   _ = (f(1, 2, 3) + (f(4, 5, 6) * f(7, f(8, 9, 10), 11)));
 }

test/statements/assign/phony/storage_buffer.wgsl

@@ -2,9 +2,9 @@ struct S {
     i : i32;
 };
 
-[[binding(0), group(0)]] var<storage, read_write> s : S;
+@binding(0) @group(0) var<storage, read_write> s : S;
 
-[[stage(compute), workgroup_size(1)]]
+@stage(compute) @workgroup_size(1)
 fn main() {
     _ = s;
     _ = s.i;

test/statements/assign/phony/storage_buffer.wgsl.expected.wgsl

@@ -2,9 +2,9 @@ struct S {
   i : i32;
 }
 
-[[binding(0), group(0)]] var<storage, read_write> s : S;
+@binding(0) @group(0) var<storage, read_write> s : S;
 
-[[stage(compute), workgroup_size(1)]]
+@stage(compute) @workgroup_size(1)
 fn main() {
   _ = s;
   _ = s.i;

test/statements/assign/phony/uniform_buffer.wgsl

@@ -2,9 +2,9 @@ struct S {
     i : i32;
 };
 
-[[binding(0), group(0)]] var<uniform> u : S;
+@binding(0) @group(0) var<uniform> u : S;
 
-[[stage(compute), workgroup_size(1)]]
+@stage(compute) @workgroup_size(1)
 fn main() {
     _ = u;
     _ = u.i;

test/statements/assign/phony/uniform_buffer.wgsl.expected.wgsl

@@ -2,9 +2,9 @@ struct S {
   i : i32;
 }
 
-[[binding(0), group(0)]] var<uniform> u : S;
+@binding(0) @group(0) var<uniform> u : S;
 
-[[stage(compute), workgroup_size(1)]]
+@stage(compute) @workgroup_size(1)
 fn main() {
   _ = u;
   _ = u.i;