Fix probing in JSON.parse.

src/json-parser.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 572 matching lines @@
       if (position >= source_length_) return Handle<String>::null();
       c0 = seq_source_->SeqAsciiStringGet(position);
     } while (c0 != '"');
     int length = position - position_;
     uint32_t hash = (length <= String::kMaxHashCalcLength)
         ? StringHasher::GetHashCore(running_hash) : length;
     Vector<const char> string_vector(
         seq_source_->GetChars() + position_, length);
     SymbolTable* symbol_table = isolate()->heap()->symbol_table();
     uint32_t capacity = symbol_table->Capacity();
-    uint32_t index = SymbolTable::FirstProbe(hash, capacity);
+    uint32_t entry = SymbolTable::FirstProbe(hash, capacity);
     uint32_t count = 1;
     while (true) {
-      Object* element = symbol_table->KeyAt(index);
+      Object* element = symbol_table->KeyAt(entry);
       if (element == isolate()->heap()->raw_unchecked_undefined_value()) {
         // Lookup failure.
         break;
       }
       if (element != isolate()->heap()->raw_unchecked_the_hole_value() &&
           String::cast(element)->IsAsciiEqualTo(string_vector)) {
         // Lookup success, update the current position.
         position_ = position;
         // Advance past the last '"'.
         AdvanceSkipWhitespace();
         return Handle<String>(String::cast(element));
       }
-      index = SymbolTable::NextProbe(hash, count++, capacity);
+      entry = SymbolTable::NextProbe(entry, count++, capacity);
     }
   }
 
   int beg_pos = position_;
   // Fast case for ASCII only without escape characters.
   do {
     // Check for control character (0x00-0x1f) or unterminated string (<0).
     if (c0_ < 0x20) return Handle<String>::null();
     if (c0_ != '\\') {
       if (seq_ascii || c0_ <= kMaxAsciiCharCode) {
@@ skipping 22 matching lines @@
   }
   ASSERT_EQ('"', c0_);
   // Advance past the last '"'.
   AdvanceSkipWhitespace();
   return result;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSON_PARSER_H_