Remove LANGUAGE_VERSION from non-coroutine codegen tests

Most of these tests used this directive as a way to opt in to a new
language feature, and most of those features are already stable for a
long time, so no opt-in is needed. Some other tests used the directive
to opt out from a language feature, replace those by the `LANGUAGE`
directive. One test used the directive to test behavior that actually
depended on the API version; use `API_VERSION` directive there instead.

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

@@ -322,9 +322,9 @@ public class BlackBoxAgainstJavaCodegenTestGenerated extends AbstractBlackBoxAga
             runTest("compiler/testData/codegen/boxAgainstJava/ieee754/explicitEqualsCall.kt");
         }
 
-        @TestMetadata("explicitEqualsCall_lv12.kt")
-        public void testExplicitEqualsCall_lv12() throws Exception {
-            runTest("compiler/testData/codegen/boxAgainstJava/ieee754/explicitEqualsCall_lv12.kt");
+        @TestMetadata("explicitEqualsCallNull.kt")
+        public void testExplicitEqualsCallNull() throws Exception {
+            runTest("compiler/testData/codegen/boxAgainstJava/ieee754/explicitEqualsCallNull.kt");
         }
 
         @TestMetadata("float.kt")

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

@@ -108,21 +108,6 @@ public class BytecodeListingTestGenerated extends AbstractBytecodeListingTest {
         runTest("compiler/testData/codegen/bytecodeListing/InlineOnlyPropertyMultifile.kt");
     }
 
-    @TestMetadata("invisibleCompanionObject.kt")
-    public void testInvisibleCompanionObject() throws Exception {
-        runTest("compiler/testData/codegen/bytecodeListing/invisibleCompanionObject.kt");
-    }
-
-    @TestMetadata("invisibleCompanionObject_lv11.kt")
-    public void testInvisibleCompanionObject_lv11() throws Exception {
-        runTest("compiler/testData/codegen/bytecodeListing/invisibleCompanionObject_lv11.kt");
-    }
-
-    @TestMetadata("invisibleCompanionObject_lv12.kt")
-    public void testInvisibleCompanionObject_lv12() throws Exception {
-        runTest("compiler/testData/codegen/bytecodeListing/invisibleCompanionObject_lv12.kt");
-    }
-
     @TestMetadata("jvmOverloadsAndParametersAnnotations.kt")
     public void testJvmOverloadsAndParametersAnnotations() throws Exception {
         runTest("compiler/testData/codegen/bytecodeListing/jvmOverloadsAndParametersAnnotations.kt");

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

@@ -1030,11 +1030,6 @@ public class BytecodeTextTestGenerated extends AbstractBytecodeTextTest {
             runTest("compiler/testData/codegen/bytecodeText/constants/noInlineNonStaticJavaField_lv10.kt");
         }
 
-        @TestMetadata("noInlineNonStaticJavaField_lv11.kt")
-        public void testNoInlineNonStaticJavaField_lv11() throws Exception {
-            runTest("compiler/testData/codegen/bytecodeText/constants/noInlineNonStaticJavaField_lv11.kt");
-        }
-
         @TestMetadata("nullableByteAndShort.kt")
         public void testNullableByteAndShort() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/constants/nullableByteAndShort.kt");

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

@@ -322,9 +322,9 @@ public class IrBlackBoxAgainstJavaCodegenTestGenerated extends AbstractIrBlackBo
             runTest("compiler/testData/codegen/boxAgainstJava/ieee754/explicitEqualsCall.kt");
         }
 
-        @TestMetadata("explicitEqualsCall_lv12.kt")
-        public void testExplicitEqualsCall_lv12() throws Exception {
-            runTest("compiler/testData/codegen/boxAgainstJava/ieee754/explicitEqualsCall_lv12.kt");
+        @TestMetadata("explicitEqualsCallNull.kt")
+        public void testExplicitEqualsCallNull() throws Exception {
+            runTest("compiler/testData/codegen/boxAgainstJava/ieee754/explicitEqualsCallNull.kt");
         }
 
         @TestMetadata("float.kt")