x86: Update Intel processor detection

Add cpu model numbers for Intel Airmont, Tremont, Comet Lake, Ice Lake
and Tiger Lake processor families.

	* config/i386/driver-i386.c (host_detect_local_cpu): Support
	Intel Airmont, Tremont, Comet Lake, Ice Lake and Tiger Lake
	processor families.

gcc/config/i386/driver-i386.c

@@ -775,9 +775,12 @@ const char *host_detect_local_cpu (int argc, const char **argv)
 	case 0x37:
 	case 0x4a:
 	case 0x4d:
-	case 0x5a:
 	case 0x5d:
 	  /* Silvermont.  */
+	case 0x4c:
+	case 0x5a:
+	case 0x75:
+	  /* Airmont.  */
 	  cpu = "silvermont";
 	  break;
 	case 0x5c:
@@ -789,6 +792,12 @@ const char *host_detect_local_cpu (int argc, const char **argv)
 	  /* Goldmont Plus.  */
 	  cpu = "goldmont-plus";
 	  break;
+	case 0x86:
+	case 0x96:
+	case 0x9c:
+	  /* Tremont.  */
+	  cpu = "tremont";
+	  break;
 	case 0x0f:
 	  /* Merom.  */
 	case 0x17:
@@ -839,6 +848,9 @@ const char *host_detect_local_cpu (int argc, const char **argv)
 	case 0x8e:
 	case 0x9e:
 	  /* Kaby Lake.  */
+	case 0xa5:
+	case 0xa6:
+	  /* Comet Lake.  */
 	  cpu = "skylake";
 	  break;
 	case 0x55:
@@ -849,6 +861,22 @@ const char *host_detect_local_cpu (int argc, const char **argv)
 	    /* Skylake with AVX-512.  */
 	    cpu = "skylake-avx512";
 	  break;
+	case 0x6a:
+	case 0x6c:
+	  /* Ice Lake server.  */
+	  cpu = "icelake-server";
+	  break;
+	case 0x7e:
+	case 0x7d:
+	case 0x9d:
+	  /* Ice Lake client.  */
+	  cpu = "icelake-client";
+	  break;
+	case 0x8c:
+	case 0x8d:
+	  /* Tiger Lake.  */
+	  cpu = "tigerlake";
+	  break;
 	case 0x57:
 	  /* Knights Landing.  */
 	  cpu = "knl";