Created by Laurynas Biveinis and last modified
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237. By Laurynas Biveinis

Annotate the MEMORY engine block allocator for Valgrind.

- Add 10-byte-long redzones before and after each block when compiled
  with Valgrind support. Mark them as inaccessible on block
- Mark block contents as undefined on block deallocation and
  allocation that recycles blocks from the free list.
- Bump block offset link from 1 << 22 to 1 << 31 for fixed-length
  blocks in order to make errorneous accesses crash sooner when
  fixed-length blocks are treated as variable-length.

235. By Stewart Smith

merge 5.5.22 as bzr branch

228. By Ignacio Nin

Merge from release branch 5.5.21-25.0

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