Fix clif ir writing for simd_gather

Author: bjorn3

src/base.rs

@@ -305,6 +305,9 @@ fn codegen_fn_body(fx: &mut FunctionCx<'_, '_, '_>, start_block: Block) {
         let source_info = bb_data.terminator().source_info;
         fx.set_debug_loc(source_info);
 
+        let _print_guard =
+            crate::PrintOnPanic(|| format!("terminator {:?}", bb_data.terminator().kind));
+
         match &bb_data.terminator().kind {
             TerminatorKind::Goto { target } => {
                 if let TerminatorKind::Return = fx.mir[*target].terminator().kind {

src/intrinsics/simd.rs

@@ -840,6 +840,8 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
                 fx.bcx.seal_block(next);
                 fx.bcx.switch_to_block(next);
 
+                fx.bcx.ins().nop();
+
                 ret.place_lane(fx, lane_idx)
                     .write_cvalue(fx, CValue::by_val(res_lane, ret_lane_layout));
             }