ARM test suite fixes
Remove some dead files
Remove Expression::dump and replace usages with Expression::print
Rename toString to toStringExp to avoid conflict with D's toString
Merge pull request #3093 from jpf91/arm-1

ARM test suite fixes
Merge pull request #3115 from yebblies/toStringExp

[DDMD] Rename toString to toStringExp to avoid conflict with D's toString
Merge pull request #3114 from yebblies/dump

[cleanup] Remove Expression::dump and replace usages with Expression::print
Merge pull request #3113 from yebblies/cleanup

[cleanup] Remove some dead files
And visitor for Initializer and Expression
Move inlineCost and inlineCost3 to a visitor class