[binning] Do not use numerical operators on atomics

This fixes a comparison expression and a compound-assignment
expression that used an atomic as an operand. These should be
treated as illegal based on my understanding of the WGSL
specification (and are rejected by Tint) but Naga accepts
them and injects appropriate atomic operations during code generation.

See https://github.com/gfx-rs/wgpu/issues/5474 for more details.

shader/binning.wgsl

diff --git a/shader/binning.wgsl b/shader/binning.wgsl
index 55d80c3..9104827 100644
--- a/shader/binning.wgsl
+++ b/shader/binning.wgsl
@@ -65,14 +65,14 @@
         atomicStore(&sh_bitmaps[i][local_id.x], 0u);
     }
     if local_id.x == 0u {
-        let failed = bump.lines > config.lines_size;
+        let failed = atomicLoad(&bump.lines) > config.lines_size;
         sh_previous_failed = u32(failed);
     }
     // also functions as barrier to protect zeroing of bitmaps
     let failed = workgroupUniformLoad(&sh_previous_failed);
     if failed != 0u {
         if global_id.x == 0u {
-            bump.failed |= STAGE_FLATTEN;
+            atomicOr(&bump.failed, STAGE_FLATTEN);
         }
         return;
     }