ceylon/ceylon.language#312: RuntimeUtil: Rename method for corresponding rename of Util method.
ceylon/ceylon.language#312: Update .src for the Util method rename
ceylon/ceylon.language#312: Remove dead code path.
ceylon/ceylon.language#312: RuntimeUtil: reflect renaming in Util.
ceylon/ceylon.language#312: Bulk update src for Util method renaming.
ceylon/ceylon.language#312: Util.sequentialOf(): Use the static type for the reified type.
ceylon/ceylon.language#312: Update tests now that sequentialOf() takes a TypeDescriptor