[JVM_IR] Fix mangling of default argument stubs for internal methods.

The MethodSignatureMapper expected to be able to look at the body
of the default argument stub. That is of course not possible when
it is from an external dependency.

Instead, we go through the attribute owner to get to the method
the stub is a default argument adapter for.

compiler/tests/org/jetbrains/kotlin/codegen/CompileKotlinAgainstKotlinTestGenerated.java

@@ -183,6 +183,11 @@ public class CompileKotlinAgainstKotlinTestGenerated extends AbstractCompileKotl
         runTest("compiler/testData/compileKotlinAgainstKotlin/internalSetterOverridden.kt");
     }
 
+    @TestMetadata("internalWithDefaultArgs.kt")
+    public void testInternalWithDefaultArgs() throws Exception {
+        runTest("compiler/testData/compileKotlinAgainstKotlin/internalWithDefaultArgs.kt");
+    }
+
     @TestMetadata("internalWithOtherModuleName.kt")
     public void testInternalWithOtherModuleName() throws Exception {
         runTest("compiler/testData/compileKotlinAgainstKotlin/internalWithOtherModuleName.kt");

compiler/tests/org/jetbrains/kotlin/codegen/ir/IrCompileKotlinAgainstKotlinTestGenerated.java

@@ -178,6 +178,11 @@ public class IrCompileKotlinAgainstKotlinTestGenerated extends AbstractIrCompile
         runTest("compiler/testData/compileKotlinAgainstKotlin/internalSetterOverridden.kt");
     }
 
+    @TestMetadata("internalWithDefaultArgs.kt")
+    public void testInternalWithDefaultArgs() throws Exception {
+        runTest("compiler/testData/compileKotlinAgainstKotlin/internalWithDefaultArgs.kt");
+    }
+
     @TestMetadata("internalWithOtherModuleName.kt")
     public void testInternalWithOtherModuleName() throws Exception {
         runTest("compiler/testData/compileKotlinAgainstKotlin/internalWithOtherModuleName.kt");

compiler/tests/org/jetbrains/kotlin/codegen/ir/JvmIrAgainstOldBoxTestGenerated.java

@@ -178,6 +178,11 @@ public class JvmIrAgainstOldBoxTestGenerated extends AbstractJvmIrAgainstOldBoxT
         runTest("compiler/testData/compileKotlinAgainstKotlin/internalSetterOverridden.kt");
     }
 
+    @TestMetadata("internalWithDefaultArgs.kt")
+    public void testInternalWithDefaultArgs() throws Exception {
+        runTest("compiler/testData/compileKotlinAgainstKotlin/internalWithDefaultArgs.kt");
+    }
+
     @TestMetadata("internalWithOtherModuleName.kt")
     public void testInternalWithOtherModuleName() throws Exception {
         runTest("compiler/testData/compileKotlinAgainstKotlin/internalWithOtherModuleName.kt");

compiler/tests/org/jetbrains/kotlin/codegen/ir/JvmOldAgainstIrBoxTestGenerated.java

@@ -178,6 +178,11 @@ public class JvmOldAgainstIrBoxTestGenerated extends AbstractJvmOldAgainstIrBoxT
         runTest("compiler/testData/compileKotlinAgainstKotlin/internalSetterOverridden.kt");
     }
 
+    @TestMetadata("internalWithDefaultArgs.kt")
+    public void testInternalWithDefaultArgs() throws Exception {
+        runTest("compiler/testData/compileKotlinAgainstKotlin/internalWithDefaultArgs.kt");
+    }
+
     @TestMetadata("internalWithOtherModuleName.kt")
     public void testInternalWithOtherModuleName() throws Exception {
         runTest("compiler/testData/compileKotlinAgainstKotlin/internalWithOtherModuleName.kt");