[wasm][asm.js] Fix and enable several asm.js tests with the new parser.

src/asmjs/asm-scanner.cc

 // Copyright 2017 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/asmjs/asm-scanner.h"
 
 #include "src/conversions.h"
 #include "src/flags.h"
 #include "src/parsing/scanner.h"
 #include "src/unicode-cache.h"
@@ skipping 127 matching lines @@
         } else {
           // TODO(bradnelson): Support unicode (probably via UnicodeCache).
           token_ = kParseError;
         }
         return;
     }
   }
 }
 
 void AsmJsScanner::Rewind() {
+  // TODO(bradnelson): Currently rewinding needs to leave in place the
+  // preceding newline state (in case a |0 ends a line).
+  // This is weird and stateful, fix me.
   DCHECK(!rewind_);
   next_token_ = token_;
   token_ = preceding_token_;
   preceding_token_ = kUninitialized;
   rewind_ = true;
-  preceded_by_newline_ = false;
   identifier_string_.clear();
 }
 
 void AsmJsScanner::ResetLocals() { local_names_.clear(); }
 
 #if DEBUG
 // Only used for debugging.
 std::string AsmJsScanner::Name(token_t token) const {
   if (token >= 32 && token < 127) {
     return std::string(1, static_cast<char>(token));
@@ skipping 240 matching lines @@
 bool AsmJsScanner::IsIdentifierPart(uc32 ch) {
   return IsIdentifierStart(ch) || (ch >= '0' && ch <= '9');
 }
 
 bool AsmJsScanner::IsNumberStart(uc32 ch) {
   return ch == '.' || (ch >= '0' && ch <= '9');
 }
 
 }  // namespace internal
 }  // namespace v8