[tint] Reflect predicate_subgroup_matrix for robustness

This enables the fuzzer to use it.

Bug: 403609264
Change-Id: I9449191776af7e7805ce1b0a15e9eb681f611742
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/243095
Reviewed-by: dan sinclair <dsinclair@chromium.org>
Commit-Queue: dan sinclair <dsinclair@chromium.org>
Auto-Submit: James Price <jrprice@google.com>
Commit-Queue: James Price <jrprice@google.com>
diff --git a/src/tint/lang/core/ir/transform/robustness.h b/src/tint/lang/core/ir/transform/robustness.h
index 2cf3d79..4371a80 100644
--- a/src/tint/lang/core/ir/transform/robustness.h
+++ b/src/tint/lang/core/ir/transform/robustness.h
@@ -82,6 +82,7 @@
                  clamp_storage,
                  clamp_uniform,
                  clamp_workgroup,
+                 predicate_subgroup_matrix,
                  bindings_ignored,
                  disable_runtime_sized_array_index_clamping);
 };