Turn off local optimizations again

It seems there are more issues with local optimizations. I did not track down
details but in one case positions were wrong after a rewrite. That was tryPatternMatchError.scala.
We should track these problems down in a different PR.

Author: odersky

compiler/test/dotty/tools/vulpix/TestConfiguration.scala

@@ -54,7 +54,7 @@ object TestConfiguration {
 
   val defaultUnoptimised = noCheckOptions ++ checkOptions ++ yCheckOptions ++ classPath
   val defaultOptimised = defaultUnoptimised :+ "-optimise"
-  val defaultOptions = defaultOptimised
+  val defaultOptions = defaultUnoptimised
   val allowDeepSubtypes = defaultOptions diff Array("-Yno-deep-subtypes")
   val allowDoubleBindings = defaultOptions diff Array("-Yno-double-bindings")
   val picklingOptions = defaultUnoptimised ++ Array(