Lower the assume intrinsic to a MIR statement

compiler/rustc_mir_transform/src/simplify.rs

@@ -500,6 +500,7 @@ impl<'tcx> Visitor<'tcx> for UsedLocals {
     fn visit_statement(&mut self, statement: &Statement<'tcx>, location: Location) {
         match statement.kind {
             StatementKind::CopyNonOverlapping(..)
+            | StatementKind::Assume(..)
             | StatementKind::Retag(..)
             | StatementKind::Coverage(..)
             | StatementKind::FakeRead(..)