Fix #368224, test-629.cs

* flowanalysis.cs (FlowBranching.StealFinallyClauses): Return true
if it crossed an unwind-protect boundary.
* iterators.cs (Yield.CheckContext): Relax check for 'yield break'.
(Yield.Resolve, Yield.DoEmit): Track whether the yield occurs
inside an unwind-protected region.
(YieldBreak.Resolve, YieldBreak.DoEmit): Likewise.
(Iterator.MarkYield): Add 'unwind_protect' parameter.  Emit a
'leave' instead of a 'br' if unwind-protected.
(Iterator.EmitYieldBreak): Likewise.

svn path=/trunk/mcs/; revision=99321

1 files changed, 14 insertions, 0 deletions

diff --git a/mcs/tests/test-629.cs b/mcs/tests/test-629.cs
new file mode 100644
index 00000000000..81133012a75
--- /dev/null
+++ b/mcs/tests/test-629.cs
@@ -0,0 +1,14 @@
+using System.Collections;
+class Foo {
+	static public IEnumerable foo ()
+	{
+		try { yield break; } catch { } finally { }
+	}
+	static int Main ()
+	{
+		int i = 0;
+		foreach (object o in foo ())
+			++i;
+		return i;
+	}
+}