[simulation] enable the platform assert (#10952)

When the ot-rcp enters the assert state, the host crashes and exits.
But the ot-rcp still runs in the dead loop and becomes an orphan
process.

This commit enables the platform assert so that the ot-rcp can
automatically exit when entering the assert state.

examples/platforms/simulation/misc.c

@@ -113,3 +113,12 @@ otPlatMcuPowerState otPlatGetMcuPowerState(otInstance *aInstance)
 #if OPENTHREAD_CONFIG_PLATFORM_LOG_CRASH_DUMP_ENABLE
 otError otPlatLogCrashDump(void) { return OT_ERROR_NONE; }
 #endif
+
+void otPlatAssertFail(const char *aFilename, int aLineNumber)
+{
+    otLogCritPlat("assert failed at %s:%d", aFilename, aLineNumber);
+
+    // For debug build, use assert to generate a core dump
+    assert(false);
+    exit(1);
+}

examples/platforms/simulation/openthread-core-simulation-config.h

@@ -147,4 +147,8 @@
 #define OPENTHREAD_CONFIG_RADIO_STATS_ENABLE 1
 #endif
 
+#ifndef OPENTHREAD_CONFIG_PLATFORM_ASSERT_MANAGEMENT
+#define OPENTHREAD_CONFIG_PLATFORM_ASSERT_MANAGEMENT 1
+#endif
+
 #endif // OPENTHREAD_CORE_SIMULATION_CONFIG_H_

tests/gtest/fake_platform.cpp

@@ -575,5 +575,5 @@ otError otPlatUdpLeaveMulticastGroup(otUdpSocket *, otNetifIdentifier, const otI
 {
     return OT_ERROR_NOT_IMPLEMENTED;
 }
-
+void otPlatAssertFail(const char *, int) {}
 } // extern "C"

tests/unit/test_platform.cpp

@@ -967,4 +967,5 @@ OT_TOOL_WEAK void otPlatDnssdStopIp4AddressResolver(otInstance *aInstance, const
 OT_TOOL_WEAK otError otPlatLogCrashDump(void) { return OT_ERROR_NONE; }
 #endif
 
+OT_TOOL_WEAK void otPlatAssertFail(const char *, int) {}
 } // extern "C"