Commits on Apr 4, 2019

1. Stash left_joins into joins to deduplicate redundant LEFT JOIN …

   Originally the `JoinDependency` has the deduplication for eager loading
   (LEFT JOIN). This re-uses that deduplication for `left_joins`.
   
   And also, This makes left join order into part of joins, i.e.:
   
   Before:
   
   ```
   association joins -> stash joins (eager loading, etc) -> string joins -> left joins
   ```
   
   After:
   
   ```
   association joins -> stash joins (eager loading, left joins, etc) -> string joins
   ```
   
   Now string joins are able to refer left joins.
   
   Fixes rails#34325.
   Fixes rails#34332.
   Fixes rails#34536.

   

   kamipo committed Apr 4, 2019
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