[FIR] Add the privateInFileInDifferentModule test

We only see the redeclaration
diagnostics on the declarations inside
the second file, because of
`FirRecorder::visitRegularClass`.
`data.state.classifierContainerFileMap`
references the last file, so
when checking the visibility of
the first `private class C { ... }`
(when collecting declarations that
conflict with the second `private class C`)
the provider returns the second file
instead of the first one, so the class
behaves as it is visible, and
`collectTopLevelConflict` returns in
this case.

As for why `INVISIBLE_*`s are reported
inside the first file: this is because
`data.state.classifierMap` stores the
last classifier it sees instead of
the first one.

^KT-62537

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirLightTreeOldFrontendDiagnosticsTestGenerated.java

@@ -35214,6 +35214,12 @@ public class FirLightTreeOldFrontendDiagnosticsTestGenerated extends AbstractFir
                 runTest("compiler/testData/diagnostics/tests/typealias/privateInFile.kt");
             }
 
+            @Test
+            @TestMetadata("privateInFileInDifferentModule.kt")
+            public void testPrivateInFileInDifferentModule() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/typealias/privateInFileInDifferentModule.kt");
+            }
+
             @Test
             @TestMetadata("projectionsInTypeAliasConstructor.kt")
             public void testProjectionsInTypeAliasConstructor() throws Exception {

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirPsiOldFrontendDiagnosticsTestGenerated.java

@@ -35328,6 +35328,12 @@ public class FirPsiOldFrontendDiagnosticsTestGenerated extends AbstractFirPsiDia
                 runTest("compiler/testData/diagnostics/tests/typealias/privateInFile.kt");
             }
 
+            @Test
+            @TestMetadata("privateInFileInDifferentModule.kt")
+            public void testPrivateInFileInDifferentModule() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/typealias/privateInFileInDifferentModule.kt");
+            }
+
             @Test
             @TestMetadata("projectionsInTypeAliasConstructor.kt")
             public void testProjectionsInTypeAliasConstructor() throws Exception {

compiler/testData/diagnostics/tests/typealias/privateInFileInDifferentModule.fir.kt

@@ -0,0 +1,25 @@
+// ISSUE: KT-62537
+// MODULE: m1
+// FILE: file1.kt
+private class C {
+    companion object
+}
+
+private typealias TA = C
+
+private val test1: C = C()
+private val test1co: C.Companion = C
+
+private val test2: TA = TA()
+private val test2co = TA
+
+// MODULE: m2(m1)
+// FILE: file2.kt
+private val test1: C = C()
+private val test1co: C.Companion = <!INITIALIZER_TYPE_MISMATCH, NO_COMPANION_OBJECT!>C<!>
+
+private val test2: TA = <!INVISIBLE_REFERENCE!>TA<!>()
+private val test2co = TA
+
+private class C
+private typealias TA = Int

compiler/testData/diagnostics/tests/typealias/privateInFileInDifferentModule.kt

@@ -0,0 +1,25 @@
+// ISSUE: KT-62537
+// MODULE: m1
+// FILE: file1.kt
+private class C {
+    companion object
+}
+
+private typealias TA = C
+
+private val test1: C = C()
+private val test1co: C.Companion = C
+
+private val test2: TA = TA()
+private val test2co = TA
+
+// MODULE: m2(m1)
+// FILE: file2.kt
+private val test1: C = C()
+private val test1co: C.<!UNRESOLVED_REFERENCE!>Companion<!> = <!NO_COMPANION_OBJECT!>C<!>
+
+private val test2: TA = <!INVISIBLE_MEMBER!>TA<!>()
+private val test2co = TA
+
+private class C
+private typealias TA = Int

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

@@ -37202,6 +37202,12 @@ public class DiagnosticTestGenerated extends AbstractDiagnosticTest {
                 runTest("compiler/testData/diagnostics/tests/typealias/privateInFile.kt");
             }
 
+            @Test
+            @TestMetadata("privateInFileInDifferentModule.kt")
+            public void testPrivateInFileInDifferentModule() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/typealias/privateInFileInDifferentModule.kt");
+            }
+
             @Test
             @TestMetadata("projectionsInTypeAliasConstructor.kt")
             public void testProjectionsInTypeAliasConstructor() throws Exception {