format-stress-sanitizer-ppc-test failed on ~ Ubuntu 18.04 PPC

Host: ubuntu1804-ppc-8.pic.build.10gen.cc
Project: WiredTiger (develop)
Commit: diff: WT-6257 rows out-of-order in history store file (#5780)

• Don't assert the handle is set, we're going to drop core in the next instruction anyway.

We use WT_DBG.key in cases other than HS dumps, always allocate it.

• Reset skiphigh for leaf pages, if the page is extended during the search, the high count can be
  wrong for the child.

• We allocate a tombstone in all paths, don't do it in two different places.

• The act of searching the tree is what configures future order checks, move the initialization to
  the correct place.

Fix a comment that documents behavior that's no longer present.

Clear the cursor order checks on reset. I don't think this is actually necessary, but it's
cleaner, and the HS code calls reset explicitly.

• Now that we clear the cursor-order checks on reset, they may never have been turned on, so
  we have to check before doing the work.

• clang-format

• Clang analyzer, skiphigh set but never read. | 09 Jun 20 16:25 UTC
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