Remove the KeyInfo cache (for now - perhaps we will add it back in later - or

maybe not since it provides negligible benefit but adds a lot of complexity
and thread-safety risk).  Add a mutex to ATTACH to deal with a data race.

FossilOrigin-Name: 03c443eaf24413d6faaa91a33575d9dfd3528b5c

diff --cc manifest
index 69fe0301032f3ea481495b563c4192f3ed9198b2,022b15647e5f430124a3d02628aebf74b4fa53a4..446beca49b0be09a398f5234c4eac183915e9ade
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Fix\sa\srace\scondition\sto\sdo\swith\svery\slarge\sindex\skeys\sin\sshared-cache\smode.
- D 2014-12-11T16:38:18.086
 -C Make\ssure\sthe\sBtree\smutex\sis\sheld\swhen\ssetting\sthe\slocking\smode\sand\sthe\nsecure\sdelete\sflag\swhen\sattaching\sa\sshared-cache\sdatabase.
 -D 2014-12-12T00:40:58.882
++C Remove\sthe\sKeyInfo\scache\s(for\snow\s-\sperhaps\swe\swill\sadd\sit\sback\sin\slater\s-\sor\nmaybe\snot\ssince\sit\sprovides\snegligible\sbenefit\sbut\sadds\sa\slot\sof\scomplexity\nand\sthread-safety\srisk).\s\sAdd\sa\smutex\sto\sATTACH\sto\sdeal\swith\sa\sdata\srace.
++D 2014-12-12T00:52:10.892
  F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
  F Makefile.in 6c4f961fa91d0b4fa121946a19f9e5eac2f2f809
  F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@@ -1228,7 -1229,7 +1229,8 @@@ F tool/vdbe_profile.tcl 67746953071a9f8
  F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
  F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
  F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
- P 258e747bb7e3a2bc46f932cc2b06c2689d43aeb0
- R 016d1b9c16d412ff926cdf599ae97f64
- U dan
- Z 8da7cca75b292da60a4687ff246cc6b3
 -P cefad47ec2ad58d7ecd58bab9a261e4d5816cd69
++P fc157dd7f18c94b7ae5f155e1b4a5d7714b7da8c 6bef7ede2bbf0a51729e1943b0b0c895cb57c718
+ R 43ea10bc03cfab6b8cae2a465b94aee2
++T +closed 6bef7ede2bbf0a51729e1943b0b0c895cb57c718
+ U drh
 -Z 01d198dabe70d93c23f2c971bf866fd9
++Z 6886c071ca5a249d6b983c22ce222f5d

diff --cc manifest.uuid
index 0de4da36020bd8c929195377b8dc78146be32fc8,2d4407626b2d46a18db213616fb4c534a083190a..e881507359922ca819f6b2ef9ba7e94cb7cbfd0d
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- fc157dd7f18c94b7ae5f155e1b4a5d7714b7da8c
 -6bef7ede2bbf0a51729e1943b0b0c895cb57c718
++03c443eaf24413d6faaa91a33575d9dfd3528b5c