Fix waking --sc wrapper when DPI/delay makes work runnable (#8394) (#8534)

Fixes #8394

src/V3Task.cpp

@@ -1534,6 +1534,13 @@ class TaskVisitor final : public VNVisitor {
                 } else {
                     cfuncp->addStmtsp(assignp);
                 }
+
+                // With --sc, also wake the SystemC wrapper: it cannot see the flag, and may
+                // otherwise sleep until its next timed slot. (usesTiming() is not known yet.)
+                if (v3Global.opt.systemC()) {
+                    assignp->addNextHere(new AstCStmt{
+                        flp, "vlSymsp->__Vm_wakeEvent.notify(sc_core::SC_ZERO_TIME);\n"});
+                }
             }
         }