[GR-39696] Report polymorphism in Hash#[].

PullRequest: truffleruby/3423

Author: aardvark179

CHANGELOG.md

@@ -19,6 +19,7 @@ Compatibility:
 Performance:
 
 * Replace a call of `-"string"` with frozen string literal at parse time (@andrykonchin).
+* Report polymorphism inside `Hash#[]` to recover performance (@aardvark179).
 
 Changes:
 

src/main/java/org/truffleruby/core/hash/HashingNodes.java

@@ -12,6 +12,7 @@
 import com.oracle.truffle.api.dsl.Cached;
 import com.oracle.truffle.api.dsl.Fallback;
 import com.oracle.truffle.api.dsl.GenerateUncached;
+import com.oracle.truffle.api.dsl.ReportPolymorphism;
 import com.oracle.truffle.api.dsl.Specialization;
 import org.truffleruby.core.basicobject.BasicObjectNodes.ObjectIDNode;
 import org.truffleruby.core.cast.ToRubyIntegerNode;
@@ -57,6 +58,7 @@ protected int hashCompareByIdentity(Object key, boolean compareByIdentity,
     // MRI: any_hash
     /** Keep consistent with {@link org.truffleruby.core.kernel.KernelNodes.HashNode} */
     @GenerateUncached
+    @ReportPolymorphism
     public abstract static class ToHashByHashCode extends RubyBaseNode {
 
         public static ToHashByHashCode create() {