--- a/graal/GraalCompiler/src/com/sun/c1x/lir/LIRBlock.java	Fri May 20 16:56:58 2011 +0200
+++ b/graal/GraalCompiler/src/com/sun/c1x/lir/LIRBlock.java	Sat May 21 17:46:54 2011 +0200
@@ -28,6 +28,7 @@
 import com.sun.c1x.alloc.*;
 import com.sun.c1x.debug.*;
 import com.sun.c1x.ir.*;
+import com.sun.c1x.util.*;
 import com.sun.c1x.value.*;
 import com.sun.cri.ci.*;
 
@@ -203,4 +204,18 @@
     public FrameState stateBefore() {
         return stateBefore;
     }
+
+    public void replaceWith(LIRBlock other) {
+        for (LIRBlock pred : predecessors) {
+            Util.replaceAllInList(this, other, pred.successors);
+        }
+        for (int i = 0; i < other.predecessors.size(); ++i) {
+            if (other.predecessors.get(i) == this) {
+                other.predecessors.remove(i);
+                other.predecessors.addAll(i, this.predecessors);
+            }
+        }
+        successors.clear();
+        predecessors.clear();
+    }
 }