Merge performance enhancements into trunk.

FossilOrigin-Name: 5a00d24b279424d257781ec3f1227e72a5d56f57

diff --cc manifest
index 530096adf2c16ba1417194eaed010f7587edb402,9b75cb0bd1d041d1403aa73ce9d934bff4c85fb0..71f64ed37f5caa36e2e08082d60cc3aea05b9c7b
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Fix\sseveral\sharmless\scompiler\swarnings\sand\sa\sdocumentation\sbug.
- D 2011-08-26T20:55:50.529
 -C About\sa\s1%\soverall\sperformance\simprovement\sby\susing\sa\smacro\sto\savoid\nno-op\scalls\sto\ssqlite3MemReleaseExternal().
 -D 2011-08-29T02:49:41.731
++C Merge\sperformance\senhancements\sinto\strunk.
++D 2011-08-29T03:08:47.559
  F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
  F Makefile.in 8c930e7b493d59099ea1304bd0f2aed152eb3315
  F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@@ -961,7 -961,7 +961,7 @@@ F tool/symbols.sh caaf6ccc7300fd4335331
  F tool/tostr.awk 11760e1b94a5d3dcd42378f3cc18544c06cfa576
  F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
  F tool/warnings.sh b7fdb2cc525f5ef4fa43c80e771636dd3690f9d2
- P 1dada5158215d1816edb69ff2610f9d2259ce19d
- R 16e082a02686bfb3de55c1b850240992
 -P b6b73a747ad8d0f026074e41c2a4adc529ec2674
++P 5454d0fe227b7c1f0e7715b6c08f97019628fc4c ff71d20a9ed129bd1785a3f7a777ce62098735b7
+ R 285e2022a0bbe1b677ddbb6dec295cd8
  U drh
- Z 9f47e5dd82da8bb114d554ebcb62232c
 -Z 74a42c07c09977852193d878c3468fe6
++Z 695e51e350fb27c7201e6f8a4ffc48bc

diff --cc manifest.uuid
index 07a8c25fcae606cb7ce1ba78adf5230e127039e3,f7d413534f8cfc16d86d7457854f03230e558e65..2d1f6a2e1e80ff93e1e47f452ef954e96c16b4cb
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 5454d0fe227b7c1f0e7715b6c08f97019628fc4c
 -ff71d20a9ed129bd1785a3f7a777ce62098735b7
++5a00d24b279424d257781ec3f1227e72a5d56f57