[WGSL] Atomics should return the size and alignment of their underlyi…

…ng type

https://bugs.webkit.org/show_bug.cgi?id=262736
<radar://116544747>

Reviewed by Tadeu Zagallo.

Return the size and alignment of the underlying type.

* Source/WebGPU/WGSL/Types.cpp:
(WGSL::Type::size const):
(WGSL::Type::alignment const):

Canonical link: https://commits.webkit.org/268953@main

Source/WebGPU/WGSL/Types.cpp

@@ -311,8 +311,9 @@ unsigned Type::size() const
         [&](const Pointer&) -> unsigned {
             RELEASE_ASSERT_NOT_REACHED();
         },
-        [&](const Atomic&) -> unsigned {
-            RELEASE_ASSERT_NOT_REACHED();
+        [&](const Atomic& a) -> unsigned {
+            RELEASE_ASSERT(a.element);
+            return a.element->size();
         },
         [&](const TypeConstructor&) -> unsigned {
             RELEASE_ASSERT_NOT_REACHED();
@@ -383,8 +384,9 @@ unsigned Type::alignment() const
         [&](const Pointer&) -> unsigned {
             RELEASE_ASSERT_NOT_REACHED();
         },
-        [&](const Atomic&) -> unsigned {
-            RELEASE_ASSERT_NOT_REACHED();
+        [&](const Atomic& a) -> unsigned {
+            RELEASE_ASSERT(a.element);
+            return a.element->alignment();
         },
         [&](const TypeConstructor&) -> unsigned {
             RELEASE_ASSERT_NOT_REACHED();