radix tree test suite: Test radix_tree_replace_slot() for multiorder entries
When we replace a multiorder entry, check that all indices reflect the new value. Also, compile the test suite with -O2, which shows other problems with the code due to some dodgy pointer operations in the radix tree code. Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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