[glsl] Add fuzzer precondition for input attachments

Change-Id: Idc3ca044384118b6a0b692a188ed928542e6d3f3
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/213655
Reviewed-by: dan sinclair <dsinclair@chromium.org>
diff --git a/src/tint/lang/glsl/writer/writer_fuzz.cc b/src/tint/lang/glsl/writer/writer_fuzz.cc
index 4741625..eeed8a9 100644
--- a/src/tint/lang/glsl/writer/writer_fuzz.cc
+++ b/src/tint/lang/glsl/writer/writer_fuzz.cc
@@ -99,6 +99,9 @@
         if (core::IsSubgroup(call->Func())) {
             return false;
         }
+        if (call->Func() == core::BuiltinFn::kInputAttachmentLoad) {
+            return false;
+        }
     }
 
     static constexpr uint32_t kMaxOffset = 0x1000;