Treat SSA transformation special, as we may have to bailout.

We forgot to bailout when we found a non-natural loop (on which
our optimizations don't work).

Change-Id: I11976b5af4c98f4f29267a74c74d34b5ad81e20c
diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index 28496e4..9d0b4a9 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -112,10 +112,10 @@
   void TransformToSSA();
   void SimplifyCFG();
 
-  // Find all natural loops in this graph. Aborts computation and returns false
-  // if one loop is not natural, that is the header does not dominate the back
-  // edge.
-  bool FindNaturalLoops() const;
+  // Analyze all natural loops in this graph. Returns false if one
+  // loop is not natural, that is the header does not dominate the
+  // back edge.
+  bool AnalyzeNaturalLoops() const;
 
   void SplitCriticalEdge(HBasicBlock* block, HBasicBlock* successor);
   void SimplifyLoop(HBasicBlock* header);