[debugger] fix step-next for tail calls.

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 820 matching lines @@
     case CONST_POOL:
       return "constant pool";
     case VENEER_POOL:
       return "veneer pool";
     case DEBUG_BREAK_SLOT_AT_POSITION:
       return "debug break slot at position";
     case DEBUG_BREAK_SLOT_AT_RETURN:
       return "debug break slot at return";
     case DEBUG_BREAK_SLOT_AT_CALL:
       return "debug break slot at call";
+    case DEBUG_BREAK_SLOT_AT_TAIL_CALL:
+      return "debug break slot at tail call";
     case CODE_AGE_SEQUENCE:
       return "code age sequence";
     case GENERATOR_CONTINUATION:
       return "generator continuation";
     case WASM_MEMORY_REFERENCE:
       return "wasm memory reference";
     case NUMBER_OF_MODES:
     case PC_JUMP:
       UNREACHABLE();
       return "number_of_modes";
@@ skipping 78 matching lines @@
     case COMMENT:
     case POSITION:
     case STATEMENT_POSITION:
     case EXTERNAL_REFERENCE:
     case DEOPT_REASON:
     case CONST_POOL:
     case VENEER_POOL:
     case DEBUG_BREAK_SLOT_AT_POSITION:
     case DEBUG_BREAK_SLOT_AT_RETURN:
     case DEBUG_BREAK_SLOT_AT_CALL:
+    case DEBUG_BREAK_SLOT_AT_TAIL_CALL:
     case GENERATOR_CONTINUATION:
     case WASM_MEMORY_REFERENCE:
     case NONE32:
     case NONE64:
       break;
     case NUMBER_OF_MODES:
     case PC_JUMP:
       UNREACHABLE();
       break;
     case CODE_AGE_SEQUENCE:
@@ skipping 1125 matching lines @@
 
 
 void Assembler::DataAlign(int m) {
   DCHECK(m >= 2 && base::bits::IsPowerOfTwo32(m));
   while ((pc_offset() & (m - 1)) != 0) {
     db(0);
   }
 }
 }  // namespace internal
 }  // namespace v8