Use a single Token::INIT for all variable initialization

src/token.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_TOKEN_H_
 #define V8_TOKEN_H_
 
 #include "src/base/logging.h"
 #include "src/globals.h"
 
@@ skipping 32 matching lines @@
   T(ELLIPSIS, "...", 0)                                              \
   T(CONDITIONAL, "?", 3)                                             \
   T(INC, "++", 0)                                                    \
   T(DEC, "--", 0)                                                    \
   T(ARROW, "=>", 0)                                                  \
                                                                      \
   /* Assignment operators. */                                        \
   /* IsAssignmentOp() and Assignment::is_compound() relies on */     \
   /* this block of enum values being contiguous and sorted in the */ \
   /* same order! */                                                  \
-  T(INIT_VAR, "=init_var", 2)                   /* AST-use only. */  \
-  T(INIT_LET, "=init_let", 2)                   /* AST-use only. */  \
-  T(INIT_CONST, "=init_const", 2)               /* AST-use only. */  \
-  T(INIT_CONST_LEGACY, "=init_const_legacy", 2) /* AST-use only. */  \
+  T(INIT, "=init", 2) /* AST-use only. */                            \
   T(ASSIGN, "=", 2)                                                  \
   T(ASSIGN_BIT_OR, "|=", 2)                                          \
   T(ASSIGN_BIT_XOR, "^=", 2)                                         \
   T(ASSIGN_BIT_AND, "&=", 2)                                         \
   T(ASSIGN_SHL, "<<=", 2)                                            \
   T(ASSIGN_SAR, ">>=", 2)                                            \
   T(ASSIGN_SHR, ">>>=", 2)                                           \
   T(ASSIGN_ADD, "+=", 2)                                             \
   T(ASSIGN_SUB, "-=", 2)                                             \
   T(ASSIGN_MUL, "*=", 2)                                             \
@@ skipping 140 matching lines @@
       case YIELD:
         return !is_generator && is_sloppy(language_mode);
       default:
         return false;
     }
     UNREACHABLE();
     return false;
   }
 
   static bool IsAssignmentOp(Value tok) {
-    return INIT_VAR <= tok && tok <= ASSIGN_MOD;
+    return INIT <= tok && tok <= ASSIGN_MOD;
   }
 
   static bool IsBinaryOp(Value op) {
     return COMMA <= op && op <= MOD;
   }
 
   static bool IsTruncatingBinaryOp(Value op) {
     return BIT_OR <= op && op <= ROR;
   }
 
@@ skipping 87 matching lines @@
   static const char* const name_[NUM_TOKENS];
   static const char* const string_[NUM_TOKENS];
   static const int8_t precedence_[NUM_TOKENS];
   static const char token_type[NUM_TOKENS];
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TOKEN_H_