Add the sqlite3_vtab_nochange() interface. Test cases are in TH3.

FossilOrigin-Name: a5d09dfaa337fa51d6e702c6aefe58824ab1e7d221c6e79166e2c6f9c7ab1501

diff --cc manifest
index c426ee99bf7d93b6b8035f9eac46bda1b953c8b2,977b35bb02eb32003114d818b4ae8b82da3c9661..e13040d2fc49dfc0ac8b8af765a810753cd5555e
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Change\szipfile\sto\sbe\sa\sWITHOUT\sROWID\svirtual\stable\sand\stable-valued\sfunction.
- D 2018-01-11T17:33:48.340
 -C Add\sthe\ssqlite3_vtab_nochange()\smethod\swhich\svirtual\stable\simplementations\ncan\suse\sto\soptimize\sUPDATEs.
 -D 2018-01-11T17:04:26.957
++C Add\sthe\ssqlite3_vtab_nochange()\sinterface.\s\sTest\scases\sare\sin\sTH3.
++D 2018-01-11T18:15:40.111
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F Makefile.in 38f84f301cbef443b2d269f67a74b8cc536469831f70df7c3e912acc04932cc2
@@@ -1698,7 -1697,10 +1698,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P 407b5ed35c178bb0dbc69c8b902652038a0653d55a58a7543f9d4857c6baf3ea
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 -R ca3c0ce043db4afb0303f36904592ef8
 -T *branch * sqlite3_vtab_nochange
 -T *sym-sqlite3_vtab_nochange *
 -T -sym-trunk *
++P 931201f64e04247ed613a0301fcc86c3a337c2ed162c6370a80c67a1dd919e7c d444b1ff39f0a1673a977b8047e1e14a49d461c9934be080d27c2392a830c1c0
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+ U drh
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++Z 90bbe9ce2100212cdce59fb9703ab09f

diff --cc manifest.uuid
index 91e729e259326a580fd65049e880cd0f4980915f,3f07edeeb692a0224fc80b7cd1f2c253473fcc18..dea0f276ffa4869125b9724ae0ca23533d78c90e
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 931201f64e04247ed613a0301fcc86c3a337c2ed162c6370a80c67a1dd919e7c
 -d444b1ff39f0a1673a977b8047e1e14a49d461c9934be080d27c2392a830c1c0
++a5d09dfaa337fa51d6e702c6aefe58824ab1e7d221c6e79166e2c6f9c7ab1501