[JVM_IR] Fix check for inline class property backing in lowering.

The inline class lowering would attempt to lower a companion object
property backing field.

^KT-47762 Fixed.

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

@@ -18910,6 +18910,12 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
             runTest("compiler/testData/codegen/box/inlineClasses/kt47609.kt");
         }
 
+        @Test
+        @TestMetadata("kt47762.kt")
+        public void testKt47762() throws Exception {
+            runTest("compiler/testData/codegen/box/inlineClasses/kt47762.kt");
+        }
+
         @Test
         @TestMetadata("mangledDefaultParameterFunction.kt")
         public void testMangledDefaultParameterFunction() throws Exception {

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/JvmInlineClassLowering.kt

@@ -424,7 +424,10 @@ private class JvmInlineClassLowering(private val context: JvmBackendContext) : F
     override fun visitGetField(expression: IrGetField): IrExpression {
         val field = expression.symbol.owner
         val parent = field.parent
-        if (parent is IrClass && parent.isInline && field.name == parent.inlineClassFieldName) {
+        if (field.origin == IrDeclarationOrigin.PROPERTY_BACKING_FIELD &&
+            parent is IrClass &&
+            parent.isInline &&
+            field.name == parent.inlineClassFieldName) {
             val receiver = expression.receiver!!.transform(this, null)
             return coerceInlineClasses(receiver, receiver.type, field.type)
         }

compiler/testData/codegen/box/inlineClasses/kt47762.kt

@@ -0,0 +1,11 @@
+inline class A(val a: Int = 1) {
+    companion object {
+        val a: Int = 2
+    }
+}
+
+fun box(): String {
+    if (A.a != 2) return "FAIL1"
+    val instance = A()
+    return if (instance.a != 1) "FAIL2" else "OK"
+}

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

@@ -18868,6 +18868,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             runTest("compiler/testData/codegen/box/inlineClasses/kt47609.kt");
         }
 
+        @Test
+        @TestMetadata("kt47762.kt")
+        public void testKt47762() throws Exception {
+            runTest("compiler/testData/codegen/box/inlineClasses/kt47762.kt");
+        }
+
         @Test
         @TestMetadata("mangledDefaultParameterFunction.kt")
         public void testMangledDefaultParameterFunction() throws Exception {

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

@@ -18910,6 +18910,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             runTest("compiler/testData/codegen/box/inlineClasses/kt47609.kt");
         }
 
+        @Test
+        @TestMetadata("kt47762.kt")
+        public void testKt47762() throws Exception {
+            runTest("compiler/testData/codegen/box/inlineClasses/kt47762.kt");
+        }
+
         @Test
         @TestMetadata("mangledDefaultParameterFunction.kt")
         public void testMangledDefaultParameterFunction() throws Exception {

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

@@ -15648,6 +15648,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             runTest("compiler/testData/codegen/box/inlineClasses/kt47609.kt");
         }
 
+        @TestMetadata("kt47762.kt")
+        public void testKt47762() throws Exception {
+            runTest("compiler/testData/codegen/box/inlineClasses/kt47762.kt");
+        }
+
         @TestMetadata("mangledDefaultParameterFunction.kt")
         public void testMangledDefaultParameterFunction() throws Exception {
             runTest("compiler/testData/codegen/box/inlineClasses/mangledDefaultParameterFunction.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrJsCodegenBoxES6TestGenerated.java

@@ -13637,6 +13637,11 @@ public class IrJsCodegenBoxES6TestGenerated extends AbstractIrJsCodegenBoxES6Tes
             runTest("compiler/testData/codegen/box/inlineClasses/kt46554.kt");
         }
 
+        @TestMetadata("kt47762.kt")
+        public void testKt47762() throws Exception {
+            runTest("compiler/testData/codegen/box/inlineClasses/kt47762.kt");
+        }
+
         @TestMetadata("mangledDefaultParameterFunction.kt")
         public void testMangledDefaultParameterFunction() throws Exception {
             runTest("compiler/testData/codegen/box/inlineClasses/mangledDefaultParameterFunction.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java

@@ -13043,6 +13043,11 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/inlineClasses/kt46554.kt");
         }
 
+        @TestMetadata("kt47762.kt")
+        public void testKt47762() throws Exception {
+            runTest("compiler/testData/codegen/box/inlineClasses/kt47762.kt");
+        }
+
         @TestMetadata("mangledDefaultParameterFunction.kt")
         public void testMangledDefaultParameterFunction() throws Exception {
             runTest("compiler/testData/codegen/box/inlineClasses/mangledDefaultParameterFunction.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java

@@ -13108,6 +13108,11 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/inlineClasses/kt46554.kt");
         }
 
+        @TestMetadata("kt47762.kt")
+        public void testKt47762() throws Exception {
+            runTest("compiler/testData/codegen/box/inlineClasses/kt47762.kt");
+        }
+
         @TestMetadata("mangledDefaultParameterFunction.kt")
         public void testMangledDefaultParameterFunction() throws Exception {
             runTest("compiler/testData/codegen/box/inlineClasses/mangledDefaultParameterFunction.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/wasm/semantics/IrCodegenBoxWasmTestGenerated.java

@@ -7158,6 +7158,11 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
             runTest("compiler/testData/codegen/box/inlineClasses/kt46554.kt");
         }
 
+        @TestMetadata("kt47762.kt")
+        public void testKt47762() throws Exception {
+            runTest("compiler/testData/codegen/box/inlineClasses/kt47762.kt");
+        }
+
         @TestMetadata("mangledDefaultParameterFunction.kt")
         public void testMangledDefaultParameterFunction() throws Exception {
             runTest("compiler/testData/codegen/box/inlineClasses/mangledDefaultParameterFunction.kt");