re PR target/86814 (xtensa port needs updating for CVE-2017-5753)

PR target/86814

Xtensa architecture is not affected by speculation.

gcc/
2018-12-31  Max Filippov  <jcmvbkbc@gmail.com>

	* config/xtensa/xtensa.c (TARGET_HAVE_SPECULATION_SAFE_VALUE):
	Define to speculation_safe_value_not_needed.

From-SVN: r267488

gcc/ChangeLog

+2018-12-31  Max Filippov  <jcmvbkbc@gmail.com>
+
+	PR target/86814
+	* config/xtensa/xtensa.c (TARGET_HAVE_SPECULATION_SAFE_VALUE):
+	Define to speculation_safe_value_not_needed.
+
 2018-12-31  Martin Liska  <mliska@suse.cz>
 
 	* predict.c (set_even_probabilities): Include also

gcc/config/xtensa/xtensa.c

@@ -331,6 +331,9 @@ static unsigned HOST_WIDE_INT xtensa_asan_shadow_offset (void);
 #undef TARGET_ASAN_SHADOW_OFFSET
 #define TARGET_ASAN_SHADOW_OFFSET xtensa_asan_shadow_offset
 
+#undef TARGET_HAVE_SPECULATION_SAFE_VALUE
+#define TARGET_HAVE_SPECULATION_SAFE_VALUE speculation_safe_value_not_needed
+
 struct gcc_target targetm = TARGET_INITIALIZER;