exception handling related changes: * changed blockPredecessors to list of Instructions, instead of Blocks * removed explicit predecessor management in BlockBegin, now using predecessors from Graph structure * replaced generated LIR exception entries with exception dispatch chains in IR * added Unwind and ExceptionDispatch instructions * removed ExceptionEntry flag in BlockBegin and all code depending on it * removed exceptionHandler list from Instruction, replaced by exception Edge on Invoke and Throw * replaced list of ExceptionHandlers with single exception edge in debug info misc: * changed GraphvizPrinter layout (smaller ports on large nodes) * removed defunct run config

--- a/graal/GraalCompiler/src/com/sun/c1x/ir/ValueVisitor.java	Fri May 13 17:09:20 2011 -0700
+++ b/graal/GraalCompiler/src/com/sun/c1x/ir/ValueVisitor.java	Wed May 18 18:09:20 2011 +0200
@@ -68,4 +68,6 @@
     public abstract void visitTableSwitch(TableSwitch i);
     public abstract void visitThrow(Throw i);
     public abstract void visitDeoptimize(Deoptimize deoptimize);
+    public abstract void visitExceptionDispatch(ExceptionDispatch exceptionDispatch);
+    public abstract void visitUnwind(Unwind unwind);
 }