[msl] Reject modules that use input_attachments

These are not supported by the MSL backend.

Fixed: 451278799
Change-Id: I1c1de3917394df05653dd839ca3913e12240ccfe
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/267274
Commit-Queue: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>

src/tint/lang/msl/writer/writer.cc

diff --git a/src/tint/lang/msl/writer/writer.cc b/src/tint/lang/msl/writer/writer.cc
index 73f4981..fb1e2c1 100644
--- a/src/tint/lang/msl/writer/writer.cc
+++ b/src/tint/lang/msl/writer/writer.cc
@@ -61,6 +61,9 @@
         if (ty->Is<core::type::ResourceBinding>()) {
             return Failure("resource_binding not supported by the MSL backend");
         }
+        if (ty->Is<core::type::InputAttachment>()) {
+            return Failure("input_attachment not supported by the MSL backend");
+        }
     }
 
     // Check for unsupported module-scope variable address spaces and types and ensure at most one
@@ -71,9 +74,6 @@
         if (ptr->AddressSpace() == core::AddressSpace::kPixelLocal) {
             return Failure("pixel_local address space is not supported by the MSL backend");
         }
-        if (ptr->StoreType()->Is<core::type::InputAttachment>()) {
-            return Failure("input attachments are not supported by the MSL backend");
-        }
     }
 
     auto user_immediate_res = core::ir::ValidateSingleUserImmediate(ir);