merge mmcm: Speed up parsing of VALUES list with literals.
merge mmcm: Speed up parsing of VALUES list with literals.

https://code.launchpad.net/~mmcm/akiban-sql-parser/simple-literal-in-list/+merge/116400
fivetran/sql-parser,storyeah/sql-parser,hudak/sql-parser,gnubila-france/sql-parser,puneetjaiswal/sql-parser,puneetjaiswal/sql-parser,mattyb149/sql-parser,rimig/sql-parser,fengshao0907/sql-parser,brosander/sql-parser,brosander/sql-parser,cswaroop/sql-parser,storyeah/sql-parser,xiexingguang/sql-parser