add stage flag for pr expand

Author: davleopo

compiler/src/jdk.internal.vm.compiler/src/org/graalvm/compiler/nodes/GraphState.java

@@ -625,6 +625,7 @@ public enum StageFlag {
         VECTOR_LOWERING,
         EXPAND_LOGIC,
         FIXED_READS,
+        PARTIAL_REDUNDANCY_SCHEDULE,
         ADDRESS_LOWERING,
         FINAL_CANONICALIZATION,
         TARGET_VECTOR_LOWERING,

compiler/src/jdk.internal.vm.compiler/src/org/graalvm/compiler/phases/common/CanonicalizerPhase.java

@@ -527,7 +527,9 @@ public static boolean gvn(Node node, NodeClass<?> nodeClass) {
     }
 
     public boolean tryGlobalValueNumbering(Node node, NodeClass<?> nodeClass) {
-        assert ((StructuredGraph) node.graph()).getGraphState().isBeforeStage(StageFlag.FIXED_READS) : "GVN must not occur after fixing reads, trying to gvn " + node + " for graph " + node.graph();
+        assert ((StructuredGraph) node.graph()).getGraphState().isBeforeStage(StageFlag.PARTIAL_REDUNDANCY_SCHEDULE) : "GVN must not occur after expanding partially redundant nodes, trying to gvn " +
+                        node +
+                        " for graph " + node.graph();
         return gvn(node, nodeClass);
     }