This reverts commit 3352fcc9.

Reason for revert: Causing wasm/tier-down-to-liftoff.js to be flaky, https://crbug.com/v8/10086

Original change's description:
> [wasm] Perform NativeModule tier down in parallel.
> 
> Reuse logic in {CompileNativeModule} function in module-compiler.cc:
> initialize parallel compile jobs, then wait for them to finish while
> taking part in this compilation.
> 
> Bug: v8:9654
> Change-Id: I9974d9f8b516e9faec716a592c7c0ee9c7077d8e
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1977041
> Commit-Queue: Z Nguyen-Huu <duongn@microsoft.com>
> Reviewed-by: Clemens Backes <clemensb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#65763}

TBR=rmcilroy@chromium.org,clemensb@chromium.org,duongn@microsoft.com

Change-Id: Ie3a0a3b2315879b6c19ef25f435fdc83c297b23b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:9654
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2002692Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65797}