Bluetooth: Controller: Reduce assertion check code size

Reduce Controller assertion check code size for ARM Cortex-M
CPUs by raising undefined instruction exception.

`arm-none-eabi-addr2line` commandline can be used to get the
source file and line number.

Signed-off-by: Vinayak Kariappa Chettimada <[email protected]>

Author: cvinayak

subsys/bluetooth/controller/hal/debug.h

@@ -27,8 +27,19 @@ void bt_ctlr_assert_handle(char *file, uint32_t line);
 		BT_ASSERT_MSG(cond, fmt, ##__VA_ARGS__)
 #endif
 
-#define LL_ASSERT_ERR(cond) LL_ASSERT(cond)
-#define LL_ASSERT_DBG(cond) LL_ASSERT(cond)
+#if defined(CONFIG_CPU_CORTEX_M)
+#define HAL_DEBUG_LL_ASSERT(x) \
+	do { \
+		if (!(x)) { \
+			__asm__ inline volatile (".inst 0xde00\n"); \
+		} \
+	} while (0)
+#else
+#define HAL_DEBUG_LL_ASSERT(x) LL_ASSERT(x)
+#endif
+
+#define LL_ASSERT_ERR(cond) HAL_DEBUG_LL_ASSERT(cond)
+#define LL_ASSERT_DBG(cond) HAL_DEBUG_LL_ASSERT(cond)
 
 #if defined(CONFIG_BT_CTLR_ASSERT_VENDOR)
 #define LL_ASSERT_INFO1(cond, param) \