Clean up vendor identification v3

Index: qemu/target-i386/cpu.h
===================================================================
@@ -333,6 +333,14 @@
 #define CPUID_EXT3_IBS     (1 << 10)
 #define CPUID_EXT3_SKINIT  (1 << 12)
 
+#define CPUID_VENDOR_INTEL_1 0x756e6547 /* "Genu" */
+#define CPUID_VENDOR_INTEL_2 0x49656e69 /* "ineI" */
+#define CPUID_VENDOR_INTEL_3 0x6c65746e /* "ntel" */
+
+#define CPUID_VENDOR_AMD_1   0x68747541 /* "Auth" */
+#define CPUID_VENDOR_AMD_2   0x69746e65 /* "enti" */ 
+#define CPUID_VENDOR_AMD_3   0x444d4163 /* "cAMD" */
+
 #define EXCP00_DIVZ	0
 #define EXCP01_SSTP	1
 #define EXCP02_NMI	2

Index: qemu/target-i386/helper.c
===================================================================
@@ -146,9 +146,9 @@ static x86_def_t x86_defs[] = {
     {
         .name = "qemu64",
         .level = 2,
-        .vendor1 = 0x68747541, /* "Auth" */
-        .vendor2 = 0x69746e65, /* "enti" */
-        .vendor3 = 0x444d4163, /* "cAMD" */
+        .vendor1 = CPUID_VENDOR_AMD_1,
+        .vendor2 = CPUID_VENDOR_AMD_2,
+        .vendor3 = CPUID_VENDOR_AMD_3,
         .family = 6,
         .model = 2,
         .stepping = 3,

@@ -347,9 +347,9 @@ static int cpu_x86_register (CPUX86State
         env->cpuid_vendor2 = def->vendor2;
         env->cpuid_vendor3 = def->vendor3;
     } else {
-        env->cpuid_vendor1 = 0x756e6547; /* "Genu" */
-        env->cpuid_vendor2 = 0x49656e69; /* "ineI" */
-        env->cpuid_vendor3 = 0x6c65746e; /* "ntel" */
+        env->cpuid_vendor1 = CPUID_VENDOR_INTEL_1;
+        env->cpuid_vendor2 = CPUID_VENDOR_INTEL_2;
+        env->cpuid_vendor3 = CPUID_VENDOR_INTEL_3;
     }
     env->cpuid_level = def->level;
     env->cpuid_version = (def->family << 8) | (def->model << 4) | def->stepping;