Add support for TARGET=ZARCH_GENERIC and TARGET=Z13

TargetList.txt

@@ -85,3 +85,6 @@ VULCAN
 THUNDERX
 THUNDERX2T99
 
+9.System Z:
+ZARCH_GENERIC
+Z13

getarch.c

@@ -137,6 +137,8 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 /* #define FORCE_ITANIUM2	*/
 /* #define FORCE_SPARC		*/
 /* #define FORCE_SPARCV7	*/
+/* #define FORCE_ZARCH_GENERIC	*/
+/* #define FORCE_Z13		*/
 /* #define FORCE_GENERIC	*/
 
 #ifdef FORCE_P2
@@ -964,6 +966,26 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #else
 #endif
 
+#ifdef FORCE_ZARCH_GENERIC
+#define FORCE
+#define ARCHITECTURE    "ZARCH"
+#define SUBARCHITECTURE "ZARCH_GENERIC"
+#define ARCHCONFIG   "-DZARCH_GENERIC " \
+       "-DDTB_DEFAULT_ENTRIES=64"
+#define LIBNAME   "zarch_generic"
+#define CORENAME  "ZARCH_GENERIC"
+#endif
+
+#ifdef FORCE_Z13
+#define FORCE
+#define ARCHITECTURE    "ZARCH"
+#define SUBARCHITECTURE "Z13"
+#define ARCHCONFIG   "-DZ13 " \
+       "-DDTB_DEFAULT_ENTRIES=64"
+#define LIBNAME   "z13"
+#define CORENAME  "Z13"
+#endif
+
 #ifndef FORCE
 
 #if defined(__powerpc__) || defined(__powerpc) || defined(powerpc) || \