add diagnostic assertions

Author: ehigham

hail/hail/src/is/hail/expr/ir/TableValue.scala

@@ -1058,6 +1058,7 @@ case class TableValue(ctx: ExecuteContext, typ: TableType, globals: BroadcastRow
     val newType = typ.copy(rowType = extracted.postAggIR.typ.asInstanceOf[TStruct])
 
     if (extracted.aggs.isEmpty) {
+      assert(false)
       val (Some(PTypeReferenceSingleCodeType(rTyp)), f) =
         Compile[AsmFunction3RegionLongLongLong](
           ctx,
@@ -1195,6 +1196,7 @@ case class TableValue(ctx: ExecuteContext, typ: TableType, globals: BroadcastRow
     }
 
     if (ctx.getFlag("distributed_scan_comb_op") != null && extracted.shouldTreeAggregate) {
+      assert(false)
       val fsBc = ctx.fs.broadcast
       val tmpBase = ctx.createTmpPath("table-map-rows-distributed-scan")
       val d = digitsNeeded(rvd.getNumPartitions)