[GR-64774] EnsureClassInitializedNode.hub should try harder to resolve to a constant

PullRequest: graal/20802

Author: tkrodriguez

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/classinitialization/EnsureClassInitializedNode.java

@@ -44,6 +44,7 @@
 import jdk.graal.compiler.nodes.spi.CanonicalizerTool;
 import jdk.graal.compiler.nodes.spi.Lowerable;
 import jdk.graal.compiler.nodes.type.StampTool;
+import jdk.graal.compiler.nodes.util.GraphUtil;
 import jdk.vm.ci.meta.ConstantReflectionProvider;
 import jdk.vm.ci.meta.ResolvedJavaType;
 
@@ -98,8 +99,9 @@ public boolean hasSideEffect() {
     }
 
     public ResolvedJavaType constantTypeOrNull(ConstantReflectionProvider constantReflection) {
-        if (hub.isConstant()) {
-            return constantReflection.asJavaType(hub.asConstant());
+        ValueNode value = GraphUtil.unproxify(hub);
+        if (value.isConstant()) {
+            return constantReflection.asJavaType(value.asConstant());
         } else {
             return null;
         }