[GR-49755] Check stamp before casting in IntegerLessThanNode

PullRequest: graal/15933

Author: gergo-

compiler/src/jdk.graal.compiler/src/jdk/graal/compiler/nodes/calc/IntegerLessThanNode.java

@@ -162,6 +162,9 @@ protected LogicNode findSynonym(ValueNode forX, ValueNode forY, NodeView view) {
             if (result != null) {
                 return result;
             }
+            if (!(forX.stamp(view) instanceof IntegerStamp)) {
+                return null;
+            }
             // always prefer unsigned comparisons, however, if part of a graph we sometimes want to
             // disable it for testing purposes
             if (forX.getOptions() == null || GraalOptions.PreferUnsignedComparison.getValue(forX.getOptions())) {