Enhance the OP_IdxInsert opcode so that it can used unpacked key values if

they are available.  Update the code generator to take advantage of this
new capability.  The speedtest1.c test is about 2.6% faster as a result.

FossilOrigin-Name: 925840cfdb969a76640a1247cc4a7b2c0de5cb74

diff --cc manifest
index fb719999e7b044e470b92df816b1860b25614b35,cca6f193f06980675cea107c341e8731cefb5b3e..fa47dd976098dabfb24b5aa0f557f3d7cbbc7124
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Fix\sa\sproblem\swith\sswitching\sfrom\swal\sto\srollback\smode\swhen\nSQLITE_DBCONFIG_NO_CKPT_ON_CLOSE\sis\sconfigured.
- D 2016-11-11T17:08:51.459
 -C Remove\sobselete\sand\sunused\slogic\sin\sthe\supdate\scode\sgenerator.\nFix\sthe\ssqlite3BtreeMovetoUnpacked()\sroutine\sso\sthat\sit\sremembers\sthe\nrowid\sof\sthe\srow\sthat\sit\slanded\son.
 -D 2016-11-11T18:19:05.491
++C Enhance\sthe\sOP_IdxInsert\sopcode\sso\sthat\sit\scan\sused\sunpacked\skey\svalues\sif\nthey\sare\savailable.\s\sUpdate\sthe\scode\sgenerator\sto\stake\sadvantage\sof\sthis\nnew\scapability.\s\sThe\sspeedtest1.c\stest\sis\sabout\s2.6%\sfaster\sas\sa\sresult.
++D 2016-11-11T19:01:11.983
  F Makefile.in 6fd48ffcf7c2deea7499062d1f3747f986c19678
  F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
  F Makefile.msc e0217f2d35a0448abbe4b066132ae20136e8b408
@@@ -1532,7 -1532,7 +1532,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
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  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
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+ R d4149095f37aacb5dfcbf6f677226eee
++T +closed 1a587d72f981cb7064cfd8916a52a83ad9ba6074
+ U drh
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diff --cc manifest.uuid
index cdd0440791a537ec106e2fc375134410e47fe39f,273415e51bec5165bc25d7d5a66de64874a2b1bc..8ea474f61b228d31376c90b3161263818e150260
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 46e0016207b8e7df2ae6c7491fd0f3c2926eed21
 -1a587d72f981cb7064cfd8916a52a83ad9ba6074
++925840cfdb969a76640a1247cc4a7b2c0de5cb74