This reverts commit 1e5b6d99.

Reason for revert: Breaks an arm64 MSAN bot - https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Linux%20-%20arm64%20-%20sim%20-%20MSAN/22601

Original change's description:
> [RCS] Create thread local runtime call stats tables for worker threads
> 
> Creating a runtime call stats table for each worker thread task is expensive.
> Instead we create a single table per thread, and use TLS to get the correct one
> when starting a worker thread task.
> 
> In order to correctly initialize the parser, scanner and parse-info's runtime
> call stats fields, we move creation of the scanner and parser onto the
> background tasks for BackgroundCompileTask and UnoptimizedCompilationJob.
> 
> Change-Id: I36064c7fb43290968620b1985cc02637b16f4232
> Reviewed-on: https://chromium-review.googlesource.com/1187522
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#55448}

TBR=rmcilroy@chromium.org,verwaest@chromium.org

Change-Id: If3f28e65667816b7ae05c5efcb2f463379bc582b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/1193224Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55449}