Fix the OP_OpenDup opcode so that it is able to duplicate a cursor that

was itself opened by OP_OpenDup.  Add additional verification of
ephemeral tables.  Fix for ticket [bb8a9fd4a9b7fce5].

FossilOrigin-Name: bcbe5308f3a3b94f965b0f5627cb29cce2e09343b86d757e2de889f7773576e7

diff --cc manifest
index 2842a636921d1929d4353d8e89be690798eba719,16608f226aaadab0088805542cef0bbefe428d1b..39f47c5b1218f489a80a4ac3df63f774591a5795
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Fix\sthe\sdbsqlfuzz-derived\sauthorizer\sin\sfuzzcheck\sto\savoid\screating\sjunk\nfiles\swhen\srunning\srogue\stests.
- D 2021-03-18T14:36:19.107
 -C Remove\sunnecessary\scode\sfrom\ssqlite3BtreeClose()\sand\sadd\stest\scases.
 -D 2021-03-18T16:36:31.997
++C Fix\sthe\sOP_OpenDup\sopcode\sso\sthat\sit\sis\sable\sto\sduplicate\sa\scursor\sthat\nwas\sitself\sopened\sby\sOP_OpenDup.\s\sAdd\sadditional\sverification\sof\nephemeral\stables.\s\sFix\sfor\sticket\s[bb8a9fd4a9b7fce5].
++D 2021-03-18T16:47:24.474
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -483,9 -483,9 +483,9 @@@ F src/auth.c 08954fdc4cc2da5264ba5b75cf
  F src/backup.c 3014889fa06e20e6adfa0d07b60097eec1f6e5b06671625f476a714d2356513d
  F src/bitvec.c 17ea48eff8ba979f1f5b04cc484c7bb2be632f33
  F src/btmutex.c 8acc2f464ee76324bf13310df5692a262b801808984c1b79defb2503bbafadb6
- F src/btree.c f5334a1c0960dc0bc74fd0b263e352e8ba632f455b6107594c59cb0492efc4af
 -F src/btree.c 227adc33e70b293955c8f36bc0264cd9e8398aadb0d2a3cd3a9c90cbe88b71fc
++F src/btree.c cfd2a37794532d765e235a2550ad2732924a6d06b07a3bc9f6a71750e3b3cca1
  F src/btree.h 096cc53baa58be22b02c896d1cf933c38cfc6d65f9253c1367ece8cc88a24de5
 -F src/btreeInt.h 7614cae30f95b6aed0c7cac7718276a55cfe2c77058cbfd8bef5b75329757331
 +F src/btreeInt.h 7bc15a24a02662409ebcd6aeaa1065522d14b7fda71573a2b0568b458f514ae0
  F src/build.c fec73c39d756f31d35ccbaa80fe1e040a8d675a318d4d30f41c444167bf3b860
  F src/callback.c d0b853dd413255d2e337b34545e54d888ea02f20da5ad0e63585b389624c4a6c
  F src/complete.c a3634ab1e687055cd002e11b8f43eb75c17da23e
@@@ -614,11 -614,11 +614,11 @@@ F src/upsert.c df8f1727d62b5987c4fd302c
  F src/utf.c ee39565f0843775cc2c81135751ddd93eceb91a673ea2c57f61c76f288b041a0
  F src/util.c 41c7a72da1df47864faa378a1c720b38adb288c6838cb6be5594511b6287a048
  F src/vacuum.c 492422c1463c076473bae1858799c7a0a5fe87a133d1223239447c422cd26286
- F src/vdbe.c 2cdbdb1e2df46fd65a72bcb2da7da2f9978407fa89b4af446e27e8f5c37a329e
 -F src/vdbe.c cba3e495c8ab25af825202dfa944e6f91d5c5cf86d415af07cac3834989d64a6
++F src/vdbe.c 95105c16c8b6decd90645ac8cf3bf0bd34e08f3371fcdaa597853547bb114360
  F src/vdbe.h 25dabb25c7e157b84e59260cfb5b466c3ac103ede9f36f4db371332c47601abe
- F src/vdbeInt.h 3df118924e1711f1bbc8e30c46260d0ab6c3b029b32dd411f789111f76434f3c
+ F src/vdbeInt.h 000d9ab1ea4cb55a80de15e28f3f595645b4fddef34bca4347fb3db8031d9041
  F src/vdbeapi.c 4a43e303ec3354c785f453e881521969378e85628278ab74ba4a9df790c0d93b
- F src/vdbeaux.c e982cb548cc29841a5b571eb56f666c3fe93e8c209ed172275fae3ff13b1ad88
 -F src/vdbeaux.c 6df834c4ff0c86a62b94fe0762d0abb7dbda54a862f0fe82e35d22fc4490414d
++F src/vdbeaux.c 1b3eaa3a70d9d1877266e8ade0d0c3b2b4c6cf77d393d94dbcbd522b9bfefc15
  F src/vdbeblob.c 253ed82894924c362a7fa3079551d3554cd1cdace39aa833da77d3bc67e7c1b1
  F src/vdbemem.c 947f2a65910edb4014dc981d33e414a68c51f169f9df8c4c493a0ba840b6eb1f
  F src/vdbesort.c f5b5e473a7cee44e47a94817b042fd7172cf3aa2c0a7928a8339d612bcfdec5a
@@@ -1910,7 -1910,7 +1910,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P ff1eca7fcdcbc550a5f23db9d85281e5373500912699a7c7ae54bc0df0547e26
- R e02544653902282c973fe57144348e27
 -P 0ec71cf16983697f68ab8d921d80a5f39611e4cb5e6e19cbc4a9ad6d49bfc835
 -R d6bb4de826da78f3ee27cd7f97de25cd
++P eca21a620630b0c8d21a91ad6a8760a6c87270ab2a45cafa18bd31b305c53dba edbfdcaefae1e9a42c046c058341bf5b0f533c0b0cbd39543fcaa2a83d67561d
++R 1fb218ba66105d95823b496a6214c38f
++T +closed edbfdcaefae1e9a42c046c058341bf5b0f533c0b0cbd39543fcaa2a83d67561d
  U drh
- Z a256c4c094c08cccb9232d4f40769c58
 -Z 33a255e216d282f4bd457b0447324171
++Z 313966120306b4f08219912928f53326

diff --cc manifest.uuid
index 453d41bd72b54c64d8c685fb4d72612e9c6cd29c,882cd91e8102dfbd61400c5ef0607cd684867499..01e431ba7a16b4b4a4d9ce45b1852ae303803ec5
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- eca21a620630b0c8d21a91ad6a8760a6c87270ab2a45cafa18bd31b305c53dba
 -edbfdcaefae1e9a42c046c058341bf5b0f533c0b0cbd39543fcaa2a83d67561d
++bcbe5308f3a3b94f965b0f5627cb29cce2e09343b86d757e2de889f7773576e7

diff --cc src/btree.c
Simple merge

diff --cc src/vdbe.c
Simple merge

diff --cc src/vdbeaux.c
Simple merge