[wasm][asm.js] Cancel exception and rethrow on parse failure.

src/asmjs/asm-typer.h

 // Copyright 2016 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 SRC_ASMJS_ASM_TYPER_H_
 #define SRC_ASMJS_ASM_TYPER_H_
 
 #include <cstdint>
 #include <string>
 #include <unordered_map>
@@ skipping 64 matching lines @@
   bool Validate();
   // Do asm.js validation in phases (to interleave with conversion to wasm).
   bool ValidateBeforeFunctionsPhase();
   bool ValidateInnerFunction(FunctionDeclaration* decl);
   bool ValidateAfterFunctionsPhase();
   void ClearFunctionNodeTypes();
 
   Handle<JSMessageObject> error_message() const { return error_message_; }
   const MessageLocation* message_location() const { return &message_location_; }
 
+  AsmType* TriggerParsingError();
+
   AsmType* TypeOf(AstNode* node) const;
   AsmType* TypeOf(Variable* v) const;
   StandardMember VariableAsStandardMember(Variable* var);
 
   // Allow the asm-wasm-builder to trigger failures (for interleaved
   // validating).
   AsmType* FailWithMessage(const char* text);
 
   typedef std::unordered_set<StandardMember, std::hash<int> > StdlibSet;
 
@@ skipping 314 matching lines @@
   ZoneVector<Assignment*> function_pointer_tables_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(AsmTyper);
 };
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // SRC_ASMJS_ASM_TYPER_H_