Simplify the vector comparison code generator logic, and the resulting

VDBE code.

FossilOrigin-Name: e2ad0b5d8e1e83118c12889150aca2f2a6b2bdde

diff --cc manifest
index ca1fac33576a420b28cd51d9ee005d650bae36a5,032853f76151954985adb84b890fca279560ae73..2542b4f4ed39c0326d6976ccda86e84a33d49d61
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Add\sVdbeCoverage()\smacros\son\snewly\sadded\sVDBE\sbranch\soperations.
- D 2016-08-12T11:25:49.567
 -C Remove\san\sunnecessary\sstack\svariable\sfrom\ssqlite3VdbeExec().
 -D 2016-08-13T14:17:02.223
++C Simplify\sthe\svector\scomparison\scode\sgenerator\slogic,\sand\sthe\sresulting\nVDBE\scode.
++D 2016-08-18T15:15:29.853
  F Makefile.in cfd8fb987cd7a6af046daa87daa146d5aad0e088
  F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
  F Makefile.msc d66d0395c38571aab3804f8db0fa20707ae4609a
@@@ -1516,7 -1516,7 +1516,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P 14009b32b955b42cfd5f0c2ce7d4b3ce19ce201e
- R 57be00fa8f04c7e5888f286343bb13cf
 -P 18f5a3bee4f870be4644a6042a20081c46edb7d0
++P 381aa73141db8ec59adbcb09e71af660ee4ae5ce c54bd9c82dd34951dc87848c0b19fcccaef928db
+ R 4db42b6f0c7885d63148768f55fefe94
++T +closed c54bd9c82dd34951dc87848c0b19fcccaef928db
  U drh
- Z c05ca00f4c6d3d32267dd4171ca3bdf0
 -Z 3f3cd455e86203369782a9bcddee8cc7
++Z 3cfa77acd6574617a13d27cce1aa0dbe

diff --cc manifest.uuid
index e0b19abe4c4b75666ea81faf0017078749ed23dc,c50c6baf38974203b596bce3b1301533a1a298aa..6d15ad67b831eec8239977cb22cbf7f3547e328e
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 381aa73141db8ec59adbcb09e71af660ee4ae5ce
 -c54bd9c82dd34951dc87848c0b19fcccaef928db
++e2ad0b5d8e1e83118c12889150aca2f2a6b2bdde