FIR: Refine inference constraints when type variable in flexible position

That issue might be fixed via changing
TypeVariableMarker.shouldBeFlexible at ConeConstraintSystemUtilContext
but this and some other tricks have been added because of incorrect
handling of constraints where type variable has a flexible bound

^KT-51168 Fixed

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java

@@ -18164,6 +18164,12 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                 runTest("compiler/testData/diagnostics/tests/j+k/flexibleNothing.kt");
             }
 
+            @Test
+            @TestMetadata("flexibleTypeVariablePosition.kt")
+            public void testFlexibleTypeVariablePosition() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/j+k/flexibleTypeVariablePosition.kt");
+            }
+
             @Test
             @TestMetadata("genericConstructorWithMultipleBounds.kt")
             public void testGenericConstructorWithMultipleBounds() throws Exception {
@@ -19187,6 +19193,12 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                     runTest("compiler/testData/diagnostics/tests/j+k/types/typeParameter.kt");
                 }
 
+                @Test
+                @TestMetadata("upperBoundsCheckAgainstSelfTypeInJava.kt")
+                public void testUpperBoundsCheckAgainstSelfTypeInJava() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/j+k/types/upperBoundsCheckAgainstSelfTypeInJava.kt");
+                }
+
                 @Test
                 @TestMetadata("varargOverride.kt")
                 public void testVarargOverride() throws Exception {
@@ -23110,6 +23122,12 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                 runTest("compiler/testData/diagnostics/tests/platformTypes/samConstructor.kt");
             }
 
+            @Test
+            @TestMetadata("starProjectionToFlexibleVariable.kt")
+            public void testStarProjectionToFlexibleVariable() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/platformTypes/starProjectionToFlexibleVariable.kt");
+            }
+
             @Test
             @TestMetadata("supertypeTypeArguments.kt")
             public void testSupertypeTypeArguments() throws Exception {
@@ -37928,6 +37946,12 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                 KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/diagnostics/testsWithStdLib/java"), Pattern.compile("^(.+)\\.kt$"), Pattern.compile("^(.+)\\.fir\\.kts?$"), true);
             }
 
+            @Test
+            @TestMetadata("assertThatOnMap.kt")
+            public void testAssertThatOnMap() throws Exception {
+                runTest("compiler/testData/diagnostics/testsWithStdLib/java/assertThatOnMap.kt");
+            }
+
             @Test
             @TestMetadata("checkEnhancedUpperBounds.kt")
             public void testCheckEnhancedUpperBounds() throws Exception {