Handle traps, illegal instruction, memory violations through queue signal

Report traps and fatal exceptions through a wavefront's
amd_queue_t.queue_inactive_signal. Previously, only traps were
reported and requireed the compiler to pass in the signal pointer
in s[0:1].

The signal is obtained through a mapping from doorbell index to
amd_queue_t*. The doorbell is fetched within a wavefront through
the gfx9+ S_SENDMSG(MSG_GET_DOORBELL) instruction.

Change-Id: I319b45f2e15dfcfe4db8f4065da1136e9539a42b

runtime/hsa-runtime/inc/hsa_ext_amd.h

@@ -64,7 +64,17 @@ enum {
   /**
    * The memory pool is invalid.
    */
-  HSA_STATUS_ERROR_INVALID_MEMORY_POOL = 40
+  HSA_STATUS_ERROR_INVALID_MEMORY_POOL = 40,
+
+  /**
+   * Agent accessed memory beyond the maximum legal address.
+   */
+  HSA_STATUS_ERROR_MEMORY_APERTURE_VIOLATION = 41,
+
+  /**
+   * Agent executed an invalid shader instruction.
+   */
+  HSA_STATUS_ERROR_ILLEGAL_INSTRUCTION = 42,
 };
 
 /**