Minimise the source code differences between 2.10 and non-2.10 compiler bridge

[dwijnand]

No description provided.

[dwijnand]

This is the current state of code duplication:

18:56:05 $ cloc internal/compiler-bridge/src/
      23 text files.
      23 unique files.
       1 file ignored.

github.com/AlDanial/cloc v 1.72  T=0.10 s (216.9 files/s, 31106.1 lines/s)
-------------------------------------------------------------------------------
Language                     files          blank        comment           code
-------------------------------------------------------------------------------
Scala                           22            318            592           2245
-------------------------------------------------------------------------------
SUM:                            22            318            592           2245
-------------------------------------------------------------------------------

18:56:27 $ cloc internal/compiler-bridge/src-2.10/
      17 text files.
      17 unique files.
       0 files ignored.

github.com/AlDanial/cloc v 1.72  T=0.07 s (251.9 files/s, 33909.4 lines/s)
-------------------------------------------------------------------------------
Language                     files          blank        comment           code
-------------------------------------------------------------------------------
Scala                           17            226            488           1574
-------------------------------------------------------------------------------
SUM:                            17            226            488           1574
-------------------------------------------------------------------------------