The new json parser reuses a lot of symbol names from the
ordinary parser and in some extreme jumbo builds those
symbols end up in the same translation unit and prevents
compilation.

This adds "Json" to some duplicate symbol names.

Change-Id: Ie38ec7e65f9807b877d35689b654c696dc880998
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1602704
Auto-Submit: Daniel Bratell <bratell@opera.com>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61403}