Restore GBT result size sanity check

backend/rust-gbt/src/gbt.rs

@@ -271,6 +271,7 @@ pub fn gbt(mempool: &mut ThreadTransactionsMap, accelerations: &[ThreadAccelerat
         block_weights,
         clusters,
         rates,
+        overflow,
     }
 }
 

backend/rust-gbt/src/lib.rs

@@ -133,6 +133,7 @@ pub struct GbtResult {
     pub block_weights: Vec<u32>,
     pub clusters: Vec<Vec<u32>>,
     pub rates: Vec<Vec<f64>>, // Tuples not supported. u32 fits inside f64
+    pub overflow: Vec<u32>,
 }
 
 /// All on another thread, this runs an arbitrary task in between