This is a reland of c92a1dda

Original change's description:
> [cpu-profiler] Fix a bug which caused a pure virtual function call
>
> We need to remove each Sampler from the SamplerManager before we call
> the Sampler destructor. This is because the signal handler can interrupt
> the destructor, and call DoSampler(), which calls sampler->SampleStack()
> on the sampler being destructed, causing general unhappiness and
> "Pure virtual function called!" crashes.
>
> Bug: v8:8346, v8:5193
> Change-Id: Iaa595a196eab33fb1af31584e9a68fd1ce0a18f6
> Reviewed-on: https://chromium-review.googlesource.com/c/1293949
> Commit-Queue: Peter Marshall <petermarshall@chromium.org>
> Reviewed-by: Alexei Filippov <alph@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#56882}

TBR=yangguo@chromium.org

Bug: v8:8346, v8:5193
Change-Id: I9878f65c868ff1aed6f3a587cba688c4241bad8c
Reviewed-on: https://chromium-review.googlesource.com/c/1298893Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56976}