Optimize the restarting of an RBU vacuum.

FossilOrigin-Name: 82062351a62f4ccc438a2b47a22ee581bd030dec952fecd610f360a25002a5ea

diff --cc manifest
index 2be5afb6943d8134e934ce121dbe951aac2db447,69f1d68b6dd64caaefcb4e3bab1003f03cb9dbca..1a7c97fbfa3351a8d2558986d196f3a45c5a16b9
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Fix\sa\sproblem\swith\srenaming\san\sINTEGER\sPRIMARY\sKEY\scolumn\sof\sa\sWITHOUT\sROWID\stable\susing\sALTER\sTABLE.
- D 2019-05-06T16:15:28.529
 -C Remove\ssome\sredundant\scode\sfrom\ssqlite3rbu.c.\sAdd\stest\scases\sfor\sRBU\svacuum.
 -D 2019-05-07T16:28:50.534
++C Optimize\sthe\srestarting\sof\san\sRBU\svacuum.
++D 2019-05-07T16:37:37.162
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  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
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diff --cc manifest.uuid
index bf849f4d39a7884d2a94e17e33959f6b6cd666c7,366634c67e2f4a02d8c859582343c6823adbfb81..ad4d935e1a617ff88f0bc4072c20dac098d89b20
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
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