Add trigger_hit field to riscv_info

Change-Id: If4e1b5c37da4ab9301d91f41ba4789662b677a29

src/target/riscv/riscv.h

@@ -124,6 +124,10 @@ typedef struct {
 	 * target controls, while otherwise only a single hart is controlled. */
 	int trigger_unique_id[RISCV_MAX_HWBPS];
 
+	/* The unique id of the trigger that caused the most recent halt. If the
+	 * most recent halt was not caused by a trigger, then this is -1. */
+	uint32_t trigger_hit;
+
 	/* The number of entries in the debug buffer. */
 	int debug_buffer_size;