[X86] Add cpu detection for cannonlake.

This uses the same encoding for cannonlake in the proposed gcc patches here. https://gcc.gnu.org/ml/gcc-patches/2017-11/msg00551.html

llvm-svn: 318610

compiler-rt/lib/builtins/cpu_model.c

@@ -75,6 +75,7 @@ enum ProcessorSubtypes {
   INTEL_COREI7_BROADWELL,
   INTEL_COREI7_SKYLAKE,
   INTEL_COREI7_SKYLAKE_AVX512,
+  INTEL_COREI7_CANNONLAKE,
   CPU_SUBTYPE_MAX
 };
 
@@ -340,6 +341,12 @@ getIntelProcessorTypeAndSubtype(unsigned Family, unsigned Model,
       *Subtype = INTEL_COREI7_SKYLAKE_AVX512; // "skylake-avx512"
       break;
 
+    // Cannonlake:
+    case 0x66:
+      *Type = INTEL_COREI7;
+      *Subtype = INTEL_COREI7_CANNONLAKE; // "cannonlake"
+      break;
+
     case 0x1c: // Most 45 nm Intel Atom processors
     case 0x26: // 45 nm Atom Lincroft
     case 0x27: // 32 nm Atom Medfield