In mcs:

In mcs:
	Revert r77431, and remove ChangeLog corruption introduced in
	r77445
In errors:
	Add new regression tests, and mark cs0158-5.cs as broken due
	to the revert above.

I decided to break cs0158-5.cs and revert rather than fix the issues since
a correct fix will be very similar to what I'm planning to do for shadowed
variables (invariant meaning in a block).

svn path=/trunk/mcs/; revision=77549