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150d4a47e4
When writing objects to the NodeStore, we need to convert them from the in-memory format to the binary format used by the node store. The conversion is handled by the `EncodedBlob` class, which is only instantiated on the stack. Coupled with the fact that most objects are under 1024 bytes in size, this presents an opportunity to elide a memory allocation in a critical path. This commit also simplifies the interface of `EncodedBlob` and eliminates a subtle corner case that could result in dangling pointers. These changes are not expected to cause a significant reduction in memory usage. The change avoids the use of a `std::shared_ptr` when unnecessary and tries to use stack-based memory allocation instead of the heap whenever possible. This is a net gain both in terms of memory usage (lower fragmentation) and performance (less work to do at runtime).