[es8] Remove syntactic tail calls support.

src/messages.h

 // Copyright 2006-2008 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.
 
 // The infrastructure used for (localized) message reporting in V8.
 //
 // Note: there's a big unresolved issue about ownership of the data
 // structures used by this framework.
 
 #ifndef V8_MESSAGES_H_
@@ skipping 575 matching lines @@
   T(TooManyParameters,                                                         \
     "Too many parameters in function definition (only 65535 allowed)")         \
   T(TooManySpreads,                                                            \
     "Literal containing too many nested spreads (up to 65534 allowed)")        \
   T(TooManyVariables, "Too many variables declared (only 4194303 allowed)")    \
   T(TypedArrayTooShort,                                                        \
     "Derived TypedArray constructor created an array which was too small")     \
   T(UnexpectedEOS, "Unexpected end of input")                                  \
   T(UnexpectedFunctionSent,                                                    \
     "function.sent expression is not allowed outside a generator")             \
-  T(UnexpectedInsideTailCall, "Unexpected expression inside tail call")        \
   T(UnexpectedReserved, "Unexpected reserved word")                            \
   T(UnexpectedStrictReserved, "Unexpected strict mode reserved word")          \
   T(UnexpectedSuper, "'super' keyword unexpected here")                        \
-  T(UnexpectedSloppyTailCall,                                                  \
-    "Tail call expressions are not allowed in non-strict mode")                \
   T(UnexpectedNewTarget, "new.target expression is not allowed here")          \
-  T(UnexpectedTailCall, "Tail call expression is not allowed here")            \
-  T(UnexpectedTailCallInCatchBlock,                                            \
-    "Tail call expression in catch block when finally block is also present")  \
-  T(UnexpectedTailCallInForInOf, "Tail call expression in for-in/of body")     \
-  T(UnexpectedTailCallInTryBlock, "Tail call expression in try block")         \
-  T(UnexpectedTailCallOfEval, "Tail call of a direct eval is not allowed")     \
   T(UnexpectedTemplateString, "Unexpected template string")                    \
   T(UnexpectedToken, "Unexpected token %")                                     \
   T(UnexpectedTokenIdentifier, "Unexpected identifier")                        \
   T(UnexpectedTokenNumber, "Unexpected number")                                \
   T(UnexpectedTokenString, "Unexpected string")                                \
   T(UnexpectedTokenRegExp, "Unexpected regular expression")                    \
   T(UnknownLabel, "Undefined label '%'")                                       \
   T(UnresolvableExport, "Module does not provide an export named '%'")         \
   T(UnterminatedArgList, "missing ) after argument list")                      \
   T(UnterminatedRegExp, "Invalid regular expression: missing /")               \
@@ skipping 71 matching lines @@
   static Handle<String> GetMessage(Isolate* isolate, Handle<Object> data);
   static std::unique_ptr<char[]> GetLocalizedMessage(Isolate* isolate,
                                                      Handle<Object> data);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_MESSAGES_H_