Align tag values with latest proposal

Reflect changes from tc39/ecma426#187.

Author: szuend

src/codec.ts

@@ -6,20 +6,20 @@ export const enum Tag {
   ORIGINAL_SCOPE_START = 0x1,
   ORIGINAL_SCOPE_END = 0x2,
   ORIGINAL_SCOPE_VARIABLES = 0x3,
-  GENERATED_RANGE_START = 0x5,
-  GENERATED_RANGE_END = 0x6,
-  GENERATED_RANGE_BINDINGS = 0x7,
-  GENERATED_RANGE_CALL_SITE = 0x9,
+  GENERATED_RANGE_START = 0x4,
+  GENERATED_RANGE_END = 0x5,
+  GENERATED_RANGE_BINDINGS = 0x6,
+  GENERATED_RANGE_CALL_SITE = 0x8,
 }
 
 export const enum EncodedTag {
   ORIGINAL_SCOPE_START = "B", // 0x1
   ORIGINAL_SCOPE_END = "C", // 0x2
   ORIGINAL_SCOPE_VARIABLES = "D", // 0x3
-  GENERATED_RANGE_START = "F", // 0x5
-  GENERATED_RANGE_END = "G", // 0x6
-  GENERATED_RANGE_BINDINGS = "H", // 0x7
-  GENERATED_RANGE_CALL_SITE = "J", // 0x9
+  GENERATED_RANGE_START = "E", // 0x4
+  GENERATED_RANGE_END = "F", // 0x5
+  GENERATED_RANGE_BINDINGS = "G", // 0x6
+  GENERATED_RANGE_CALL_SITE = "I", // 0x8
 }
 
 export const enum OriginalScopeFlags {