In mcs:

In mcs:
	* flowanalysis.cs (UsageVector.MergeJumpOrigins): Kill.
	(FlowBranchingBlock.Label): Use UsageVector.MergeOrigins.
	(FlowBranchingException.Label): Likewise.

In gmcs:
	* flowanalysis.cs (UsageVector.MergeJumpOrigins): Kill.
	(FlowBranchingBlock.Label): Use UsageVector.MergeOrigins.
	(FlowBranchingException.Label): Likewise.

In tests:
	* test-154.cs (test39): Move buggy testcase to errors/cs0177-7.cs.
	Fix it and move ...
	* test-510.cs: ... here.

In errors:
	* cs0177-7.cs: Taken from erroneous sub-test in tests/test-154.cs.

svn path=/trunk/mcs/; revision=60584