[parser] remove %catch parsing

src/ast/prettyprinter.cc

 // 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.
 
 #include "src/ast/prettyprinter.h"
 
 #include <stdarg.h>
 
 #include "src/ast/ast-value-factory.h"
 #include "src/ast/scopes.h"
@@ skipping 861 matching lines @@
   PrintIndentedVisit("TRY", node->try_block());
   PrintIndented("CATCH PREDICTION");
   const char* prediction = "";
   switch (node->catch_prediction()) {
     case HandlerTable::UNCAUGHT:
       prediction = "UNCAUGHT";
       break;
     case HandlerTable::CAUGHT:
       prediction = "CAUGHT";
       break;
-    case HandlerTable::PROMISE:
-      prediction = "PROMISE";
-      break;
     case HandlerTable::DESUGARING:
       prediction = "DESUGARING";
       break;
     case HandlerTable::ASYNC_AWAIT:
       prediction = "ASYNC_AWAIT";
       break;
+    case HandlerTable::PROMISE:
+      // Catch prediction resulting in promise rejections aren't
+      // parsed by the parser.
+      UNREACHABLE();
   }
   Print(" %s\n", prediction);
 }
 
 void AstPrinter::VisitDebuggerStatement(DebuggerStatement* node) {
   IndentedScope indent(this, "DEBUGGER", node->position());
 }
 
 
 void AstPrinter::VisitFunctionLiteral(FunctionLiteral* node) {
@@ skipping 307 matching lines @@
 
 void AstPrinter::VisitRewritableExpression(RewritableExpression* node) {
   Visit(node->expression());
 }
 
 
 #endif  // DEBUG
 
 }  // namespace internal
 }  // namespace v8