Avoid a few unnecessary fstat()s on journal files.

FossilOrigin-Name: dbf84705913c0845ca4e75eb30c91536c754efeb

diff --cc manifest
index 9530ffa5fca5f6a1fdcb6c966d2d7c87233c498c,11df61697b023b5016114ee4139953339256c039..000b9dec541ce2296dfdef5c645014367d411cd7
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,10 -1,10 +1,10 @@@
- C Fix\sthe\squery\splanner\sso\sthat\sit\sis\sable\sto\suse\sthe\sinteger\sprimary\skey\nfrom\san\sindex\sas\spart\sof\sa\smulti-column\sconstraint.
- D 2016-03-16T18:26:54.117
 -C Avoid\sunnecessary\swork\sinside\sof\sverifyDbFile()\sin\sthe\sunix\sVFS.
 -D 2015-12-08T14:37:16.738
 -F Makefile.in 28bcd6149e050dff35d4dcfd97e890cd387a499d
++C Avoid\sa\sfew\sunnecessary\sfstat()s\son\sjournal\sfiles.
++D 2016-03-16T19:10:46.537
 +F Makefile.in f53429fb2f313c099283659d0df6f20f932c861f
  F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 -F Makefile.msc e8fdca1cb89a1b58b5f4d3a130ea9a3d28cb314d
 +F Makefile.msc df0bf9ff7f8b3f4dd9fb4cc43f92fe58f6ec5c66
  F README.md 8ecc12493ff9f820cdea6520a9016001cb2e59b7
 -F VERSION 8b9d3ac6f1962f94e06ba05462422a544f9c4e36
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  F art/sqlite370.ico af56c1d00fee7cd4753e8631ed60703ed0fc6e90
@@@ -327,40 -316,40 +327,40 @@@ F src/msvc.h d9ba56c6851227ab44b3f228a3
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 -F src/mutex_unix.c fc54f25b2a750d53b32512a4a728cec28039ae2a
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  F src/mutex_w32.c 5e6fe1c298fb5a8a15aaed4161d5759311431c17
  F src/notify.c 9711a7575036f0d3040ba61bc6e217f13a9888e7
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 -F src/os_win.c 386fba30419e8458b13209781c2af5590eab2811
++F src/os_unix.c 4bde11921a2bebcf2167efc8540ddabc814189dc
 +F src/os_win.c cbf8c442a0d818d05bcf40b093cb3ebad435b9be
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 -F src/printf.c 9a9105464fbbdf84b81fb902f2eaf1f771896af1
 +F src/pager.c 38718a019ca762ba4f6795425d5a54db70d1790d
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  F src/random.c ba2679f80ec82c4190062d756f22d0c358180696
 -F src/resolve.c a83b41104e6ff69855d03cd0aaa09e93927ec39f
 -F src/rowset.c eccf6af6d620aaa4579bd3b72c1b6395d9e9fa1e
 -F src/select.c f8fded11fc443a9f5a73cc5db069d06b34460e2f
 -F src/shell.c abbc74ea43dbf2f306ea18282d666683fb5efab2
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 -F src/sqlite3.rc 992c9f5fb8285ae285d6be28240a7e8d3a7f2bad
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 +F src/shell.c 5e0ab1e708dc294330ccd8230536e1801f60822e
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  F src/sqlite3ext.h dfbe62ffd95b99afe2140d8c35b180d11924072d
 -F src/sqliteInt.h 64256d193a16a147d9f6317cc4e095fdd3e0a2e9
 -F src/sqliteLimit.h 216557999cb45f2e3578ed53ebefe228d779cb46
 +F src/sqliteInt.h 84c673f27b77dfbd367cb3ed1de8b6f3b73102dc
 +F src/sqliteLimit.h 7b28cf72cbd52f178bfc97ea266445e351f2cd24
  F src/status.c 70912d7be68e9e2dbc4010c93d344af61d4c59ba
 -F src/table.c 51b46b2a62d1b3a959633d593b89bab5e2c9155e
 -F src/tclsqlite.c d9439b6a910985b7fff43ba6756bcef00de22649
 -F src/test1.c 90c4e80c7f4b0ad82c6dbe699c8f430b641769f5
 +F src/table.c 5226df15ab9179b9ed558d89575ea0ce37b03fc9
 +F src/tclsqlite.c 4bf3bea9b03aeac176ac114700f35f76a1de4c8a
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  F src/test2.c 5586f43fcd9a1be0830793cf9d354082c261b25b
  F src/test3.c a8887dabbbee3059af338f20d290084a63ed1b0f
  F src/test4.c d168f83cc78d02e8d35567bb5630e40dcd85ac1e
@@@ -1433,30 -1406,12 +1433,31 @@@ F tool/varint.c 5d94cb5003db9dbbcbcc5df
  F tool/vdbe-compress.tcl 5926c71f9c12d2ab73ef35c29376e756eb68361c
  F tool/vdbe_profile.tcl 246d0da094856d72d2c12efec03250d71639d19f
  F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 -F tool/warnings.sh 48bd54594752d5be3337f12c72f28d2080cb630b
 +F tool/warnings.sh a98af506df552f3b3c0d904f94e4cdc4e1a6d598
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 -R cc3c3a45cf6a02d31e382067a458ce71
 -T *branch * unix-vfs-optimization
 -T *sym-unix-vfs-optimization *
 -T -sym-trunk *
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 +F vsixtest/App.xaml.cpp c465147f50871165c60ca16955219f6c5812d6d8
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  U drh
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++Z 6f4affaf464559d5d4fad621b1dda7eb

diff --cc manifest.uuid
index 11ed7df76598063d03d0f228ed58a5dedf2327a8,12ed6b4bd9e45ec4b47005e10dd66e437cc1f56d..9fc448cbd893210e0f345f38c4d501849b5a24c7
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 96ea9909429f0b3b4a67002e8340ae3f7dc0b73f
 -f3c0579e931799088e9a83757e25bae229120697
++dbf84705913c0845ca4e75eb30c91536c754efeb

diff --cc src/os_unix.c
Simple merge