Add the two-size lookaside memory allocator. Also, reduce the per-entry

size of the ExprList object.

FossilOrigin-Name: 51665bf0f975fb248964a4be205a4f3285d3f3f8cc697977d264efefbbe20dd8

diff --cc manifest
index e7281ec469724546beec8a368c2227bd042d251e,7cfd44f858a6e275d18c698757c2147f5d1ee28e..ed9effd8466a823359343247b269d3d87233dee6
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Do\snot\sallow\sthe\szipfile\svirtual\stable\sto\sstart\sa\stransaction\sif\sno\nfilename\shas\sbeen\sspecified.
- D 2020-01-02T21:30:13.891
 -C NEVER()\sand\sALWAYS()\smacros\stagging\sunreachable\sbranches.
 -D 2020-01-02T22:23:01.861
++C Add\sthe\stwo-size\slookaside\smemory\sallocator.\s\sAlso,\sreduce\sthe\sper-entry\nsize\sof\sthe\sExprList\sobject.
++D 2020-01-02T22:28:47.433
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -1853,7 -1853,7 +1853,8 @@@ 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 896a86b40586a93b7de7ff4de391d81d
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  U drh
- Z 36e9c165e34c3938dc7f6f92537f7688
 -Z b012354b66730a3de909478223de72aa
++Z 486c5971cb86c4301cea954c124cc71f

diff --cc manifest.uuid
index ed83f643ec8c23b5e63895ffbf211b530e46a540,266bf3350fb84443fdb5a519d13fa3ced674ea2d..b1fa06af2e6e99a65946954ffe13bbf04d68ff43
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 7405e982257611803792617f5d8142c54f9831b4a030f4de8607888c525e6289
 -34b877742ef78e9bb3f16815180f4ad9cd722beb1d610f713400a3b25d68aa9b
++51665bf0f975fb248964a4be205a4f3285d3f3f8cc697977d264efefbbe20dd8