Add support for dumping board-specific information on assertion. From David Sidrane

arch/x86/src/common/up_assert.c

@@ -299,5 +299,10 @@ void up_assert(const uint8_t *filename, int lineno)
 #endif
 
   up_dumpstate();
+
+#ifdef CONFIG_BOARD_CRASHDUMP
+  board_crashdump(up_getsp(), g_readytorun.head, filename, lineno);
+#endif
+
   _up_assert(EXIT_FAILURE);
 }