tcg: Change TCGType to an enumeration.

The TCGType name was already used consistently.  Changing it
to an enumeration instead of a set of defines aids debugging.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
diff --git a/tcg/tcg.h b/tcg/tcg.h
index dd02a47..166c889 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -96,17 +96,22 @@
    this value, they are statically allocated in the TB stack frame */
 #define TCG_STATIC_CALL_ARGS_SIZE 128
 
-typedef int TCGType;
-
-#define TCG_TYPE_I32 0
-#define TCG_TYPE_I64 1
-#define TCG_TYPE_COUNT 2 /* number of different types */
+typedef enum TCGType {
+    TCG_TYPE_I32,
+    TCG_TYPE_I64,
+    TCG_TYPE_COUNT, /* number of different types */
 
 #if TCG_TARGET_REG_BITS == 32
-#define TCG_TYPE_PTR TCG_TYPE_I32
+    TCG_TYPE_PTR = TCG_TYPE_I32,
 #else
-#define TCG_TYPE_PTR TCG_TYPE_I64
+    TCG_TYPE_PTR = TCG_TYPE_I64,
 #endif
+#if TARGET_LONG_BITS == 64
+    TCG_TYPE_TL = TCG_TYPE_I64,
+#else
+    TCG_TYPE_TL = TCG_TYPE_I32,
+#endif
+} TCGType;
 
 typedef tcg_target_ulong TCGArg;