Refactor test

Legacy-tests seems to always compile files together, but cooking
only works for Java files read by ClassfileParser. I don't think
it makes sense to change that - if we compile Java files from sources
we should demand that raw types are re-written as wildcard types.

So to fix this we move the offending files to pos-special and compile
them only in CompilationTests.

Author: odersky

compiler/test/dotty/tools/dotc/CompilationTests.scala

@@ -66,6 +66,7 @@ class CompilationTests extends ParallelTesting {
       ),
       scala2Mode
     ) +
+    compileFilesInDir("../tests/pos-special/i3273", defaultOptions) +
     compileFilesInDir("../tests/pos-special/spec-t5545", defaultOptions) +
     compileFilesInDir("../tests/pos-special/strawman-collections", defaultOptions) +
     compileFile("../scala2-library/src/library/scala/collection/immutable/IndexedSeq.scala", defaultOptions) +