[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

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosticCompilerTestFE10TestdataTestGenerated.java

@@ -35214,6 +35214,12 @@ public class DiagnosticCompilerTestFE10TestdataTestGenerated extends AbstractDia
                 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 {

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated.java

@@ -35214,6 +35214,12 @@ public class LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated
                 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 {