Fix gcc build.

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 868 matching lines @@
 
 void AstPrinter::VisitTryFinallyStatement(TryFinallyStatement* node) {
   IndentedScope indent(this, "TRY FINALLY", node->position());
   PrintTryStatement(node);
   PrintIndentedVisit("FINALLY", node->finally_block());
 }
 
 void AstPrinter::PrintTryStatement(TryStatement* node) {
   PrintIndentedVisit("TRY", node->try_block());
   PrintIndented("CATCH PREDICTION");
-  const char* 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;
@@ skipping 287 matching lines @@
 
 void AstPrinter::VisitRewritableExpression(RewritableExpression* node) {
   Visit(node->expression());
 }
 
 
 #endif  // DEBUG
 
 }  // namespace internal
 }  // namespace v8