Always set the merge base used to merge the commit (#15352) #15385
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Backport #15352
The issue is that the TestPatch will reset the PR MergeBase - and it is possible for TestPatch to update the MergeBase whilst a merge is ongoing. The ensuing merge will then complete but it doesn't re-set the MergeBase it used to merge the PR.
Fixes the intermittent error in git test.
Signed-off-by: Andrew Thornton art27@cantab.net