Do not factor out constant functions into the initialization section of a

prepared statement, because even though they are constant, they can still
throw exceptions.  Instead, put such functions in an OP_Once block.  This
fixes ticket [3c9eadd2a6ba0aa5] and causes COALESCE() and CASE...END to
be short-circuit.

FossilOrigin-Name: c5f96a085db9688a09793f52ce1ecf033c2e6e2e5873a19fe0fb374b242b317f

diff --cc manifest
index 9ee146f83d87e740cebd5f2c1f4def9a71679b9f,b990d901bdb186d7d13ee82914c2e5801dfd79ea..dd6de47492d8b48b18da3cfaaec0ecbd777f62a0
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C This\svariant\sto\sthe\sfix\sfor\sticket\s[e0c2ad1aa8a9c691]\suses\sfewer\sCPU\scycles.
- D 2020-03-11T02:04:15.678
 -C Rename\ssqlite3ExprCodeAtInit()\sto\ssqlite3ExprCodeRunJustOnce().\nOther\schanges\sto\smake\sthe\snew\scode\scleaner.\s\sTest\scases\sadded.
 -D 2020-03-11T19:41:49.390
++C Do\snot\sfactor\sout\sconstant\sfunctions\sinto\sthe\sinitialization\ssection\sof\sa\nprepared\sstatement,\sbecause\seven\sthough\sthey\sare\sconstant,\sthey\scan\sstill\nthrow\sexceptions.\s\sInstead,\sput\ssuch\sfunctions\sin\san\sOP_Once\sblock.\s\sThis\nfixes\sticket\s[3c9eadd2a6ba0aa5]\sand\scauses\sCOALESCE()\sand\sCASE...END\sto\nbe\sshort-circuit.
++D 2020-03-11T19:56:26.290
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -1860,7 -1860,7 +1860,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
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- R 37bce3d92e4cf86464a6bfb5a7dc2299
 -P 97a18a5cd701848a9660385e31bffe2c397e3cfe57ccdb876f44d08c00d1d39a
++P fb5a8a9edd0a4f979d6c30278d4ddc73c651f56ae989b4e5983fca36887c5ceb d7f18489978fdbbe3ab317485518cac91a75416ccef55898301afdd76d3b415b
+ R bb18f5b4c4c1d8067c8d33e0ad339acb
++T +closed d7f18489978fdbbe3ab317485518cac91a75416ccef55898301afdd76d3b415b
  U drh
- Z 0b4099ba8ff5f2f0e887def300e748c2
 -Z 791b16818e473b4676673e9f9494706b
++Z 0612eee0f98137a25a8377c8a68a78fc

diff --cc manifest.uuid
index 0b01cdc6f0b7d4941e6e077518613726edad521b,9e7309105a3d2766b7e7e6e650902dfc5ba0b89d..0b3dd1b4d9c2d66e2af48175e18defc269ef76b8
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- fb5a8a9edd0a4f979d6c30278d4ddc73c651f56ae989b4e5983fca36887c5ceb
 -d7f18489978fdbbe3ab317485518cac91a75416ccef55898301afdd76d3b415b
++c5f96a085db9688a09793f52ce1ecf033c2e6e2e5873a19fe0fb374b242b317f