[roll] Roll fuchsia [memory_sampler] (Poisson) sampling in bytes between samples. With the current instrumentation strategy, reporting every single allocation and deallocation is prohibitively expensive on moderately-to-large sized processes: the FIDL channel used to communicate data with the profiler service fills up too fast in the absence of backpressure, causing the connection to eventually be severed. To mitigate this, this instrumentation randomly samples the allocations to be reported, hence providing a way to reduce the instrumentation overhead at the cost of accuracy. We use a sampling strategy similar to that of Chromium's and tcmalloc's sampling heap profilers: Poisson sampling with a constant average sampling interval, in number of bytes allocated between samples. This initial support embeds a constant interval; we intend to introduce configurability in a subsequent commit. Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/864019 Original-Revision: d304cc38419b71cf039791f4c99798173a4bd9b0 GitOrigin-RevId: df8e5c94c99abede9cf85b0485095c1040d8923d Change-Id: Id17241c21e3fba9c818eccd91ee0730fc7aff17e
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