Turbolizer can fail to open traces that contain 'StoreLine' nodes.
There is a problem in operator<<(std::ostream& os, StoreLaneParameters
params) that prints StoreLaneParameters.laneidx as a char and not as
an integer, and this can cause the insertion of string terminators in
the trace json file.
This CL fixes the issue.

Change-Id: Icf7700660cca2b4068f61dafa0c8f485b1aa497a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3035362
Commit-Queue: Paolo Severini <paolosev@microsoft.com>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75767}