S/390: Support IBM z14 Model ZR1 with -march=native

This adds the CPU model number of the IBM z14 Model ZR1 machine to
-march=native.  The patch doesn't actually change anything since we
anyway default to z14 for unknown CPU model numbers.  So this is just
for the sake of completeness.

2018-10-02  Andreas Krebbel  <krebbel@linux.ibm.com>

	* config/s390/driver-native.c (s390_host_detect_local_cpu): Add
	0x3907 as CPU model number.

From-SVN: r264797

gcc/ChangeLog

 2018-10-02  Andreas Krebbel  <krebbel@linux.ibm.com>
 
+	* config/s390/driver-native.c (s390_host_detect_local_cpu): Add
+	0x3907 as CPU model number.
+
+2018-10-02  Andreas Krebbel  <krebbel@linux.ibm.com>
+
 	* common/config/s390/s390-common.c: Rename PF_ARCH12 to PF_Z14.
 	* config/s390/s390.h (enum processor_flags): Rename PF_ARCH12 to
 	PF_Z14.  Rename TARGET_CPU_ARCH12 to TARGET_CPU_Z14,

gcc/config/s390/driver-native.c

@@ -116,6 +116,7 @@ s390_host_detect_local_cpu (int argc, const char **argv)
 	      cpu = "z13";
 	      break;
 	    case 0x3906:
+	    case 0x3907:
 	      cpu = "z14";
 	      break;
 	    default: