K2: Do not fix variables that has yet unprocessed constraints in forks

Otherwise, exception from org.jetbrains.kotlin.resolve.calls.inference.components.ConstraintInjector.TypeCheckerStateForConstraintInjector.fixedTypeVariable
might happen during forks resolution

The test data is extracted from intelliJ FP test

^KT-43296 Fixed

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

@@ -15999,6 +15999,18 @@ public class DiagnosticTestGenerated extends AbstractDiagnosticTest {
                     KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/diagnostics/tests/inference/forks"), Pattern.compile("^(.*)\\.kts?$"), Pattern.compile("^(.+)\\.fir\\.kts?$"), true);
                 }
 
+                @Test
+                @TestMetadata("nestedCallVariableFixation.kt")
+                public void testNestedCallVariableFixation() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/inference/forks/nestedCallVariableFixation.kt");
+                }
+
+                @Test
+                @TestMetadata("nestedCallVariableFixationSimple.kt")
+                public void testNestedCallVariableFixationSimple() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/inference/forks/nestedCallVariableFixationSimple.kt");
+                }
+
                 @Test
                 @TestMetadata("overloadResolutionByLambdaReturnTypeAndExpectedType.kt")
                 public void testOverloadResolutionByLambdaReturnTypeAndExpectedType() throws Exception {