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Instead of copying the full stack from the previous sample when identical, the new ProfileBufferEntryKind::TimeBeforeSameSample + SameSample entry pair indicates that this is an identical sample. Later when producing the final JSON profile, we can just re-use the same sample identifier as before. This effectively lowers the size of this kind of entry from hundreds of bytes, down to 20-30 bytes, which should help with capturing more samples in the same buffer size. And it also uses less CPU resources, since we don't need to find the previous stack and copy it. We still need to perform a full copy at the start of a buffer chunk, to make sure there is always a full stack available in case older previous chunks have been destroyed. Differential Revision: https://phabricator.services.mozilla.com/D122679
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