Devirtualization fails to eliminate boxing in function reference context

^KT-49847 Fixed

Merge-request: KT-MR-6460
Merged-by: Vladimir Sukharev <Vladimir.Sukharev@jetbrains.com>

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java

@@ -41912,6 +41912,12 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
                 runTest("compiler/testData/codegen/box/reflection/genericSignature/genericBackingFieldSignature.kt");
             }
 
+            @Test
+            @TestMetadata("genericFunctionReferenceSignature.kt")
+            public void testGenericFunctionReferenceSignature() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/genericSignature/genericFunctionReferenceSignature.kt");
+            }
+
             @Test
             @TestMetadata("genericMethodSignature.kt")
             public void testGenericMethodSignature() throws Exception {

compiler/testData/codegen/box/reflection/genericSignature/genericFunctionReferenceSignature.kt

@@ -0,0 +1,12 @@
+// WITH_REFLECT
+
+package test
+
+fun <T> foo(x: T) = x
+
+fun box(): String {
+    val bar: kotlin.reflect.KFunction1<Int, Int> = ::foo
+    val returnType = bar.returnType
+    if (returnType.toString() != "T") return returnType.toString()
+    return "OK"
+}

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java

@@ -41306,6 +41306,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
                 runTest("compiler/testData/codegen/box/reflection/genericSignature/genericBackingFieldSignature.kt");
             }
 
+            @Test
+            @TestMetadata("genericFunctionReferenceSignature.kt")
+            public void testGenericFunctionReferenceSignature() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/genericSignature/genericFunctionReferenceSignature.kt");
+            }
+
             @Test
             @TestMetadata("genericMethodSignature.kt")
             public void testGenericMethodSignature() throws Exception {

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java

@@ -41912,6 +41912,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
                 runTest("compiler/testData/codegen/box/reflection/genericSignature/genericBackingFieldSignature.kt");
             }
 
+            @Test
+            @TestMetadata("genericFunctionReferenceSignature.kt")
+            public void testGenericFunctionReferenceSignature() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/genericSignature/genericFunctionReferenceSignature.kt");
+            }
+
             @Test
             @TestMetadata("genericMethodSignature.kt")
             public void testGenericMethodSignature() throws Exception {

compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -33159,6 +33159,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
                 runTest("compiler/testData/codegen/box/reflection/genericSignature/genericBackingFieldSignature.kt");
             }
 
+            @TestMetadata("genericFunctionReferenceSignature.kt")
+            public void testGenericFunctionReferenceSignature() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/genericSignature/genericFunctionReferenceSignature.kt");
+            }
+
             @TestMetadata("genericMethodSignature.kt")
             public void testGenericMethodSignature() throws Exception {
                 runTest("compiler/testData/codegen/box/reflection/genericSignature/genericMethodSignature.kt");