Use spans to improve performance in StreamExts. #21186
Merged
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Also avoid ReadBytes calls that allocate a buffer by either updating the stream position (if not interested in the bytes), by reusing an input buffer (if interested in the bytes), or using a stackalloc buffer to avoid the allocation (for small reads).
This isn't motivated by any specific performance benchmark, but rather just on the basis that moving towards using more span features in something that affects a large chunk of the codebase such as streams will provide some incremental gains.