8267578: Remove unnecessary preview checks

Reviewed-by: jlahoda

Author: lgxbslgx

src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Attr.java

@@ -167,9 +167,7 @@ protected Attr(Context context) {
         allowLambda = Feature.LAMBDA.allowedInSource(source);
         allowDefaultMethods = Feature.DEFAULT_METHODS.allowedInSource(source);
         allowStaticInterfaceMethods = Feature.STATIC_INTERFACE_METHODS.allowedInSource(source);
-        allowReifiableTypesInInstanceof =
-                Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source) &&
-                (!preview.isPreview(Feature.REIFIABLE_TYPES_INSTANCEOF) || preview.isEnabled());
+        allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
         allowRecords = Feature.RECORDS.allowedInSource(source);
         sourceName = source.name;
         useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
@@ -3996,9 +3994,6 @@ public void visitTypeTest(JCInstanceOf tree) {
         if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
             boolean valid = false;
             if (allowReifiableTypesInInstanceof) {
-                if (preview.isPreview(Feature.REIFIABLE_TYPES_INSTANCEOF)) {
-                    preview.warnPreview(tree.expr.pos(), Feature.REIFIABLE_TYPES_INSTANCEOF);
-                }
                 Warner warner = new Warner();
                 if (!types.isCastable(exprtype, clazztype, warner)) {
                     chk.basicHandler.report(tree.expr.pos(),

src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Resolve.java

@@ -146,8 +146,7 @@ protected Resolve(Context context) {
         Target target = Target.instance(context);
         allowFunctionalInterfaceMostSpecific = Feature.FUNCTIONAL_INTERFACE_MOST_SPECIFIC.allowedInSource(source);
         allowLocalVariableTypeInference = Feature.LOCAL_VARIABLE_TYPE_INFERENCE.allowedInSource(source);
-        allowYieldStatement = (!preview.isPreview(Feature.SWITCH_EXPRESSION) || preview.isEnabled()) &&
-                Feature.SWITCH_EXPRESSION.allowedInSource(source);
+        allowYieldStatement = Feature.SWITCH_EXPRESSION.allowedInSource(source);
         checkVarargsAccessAfterResolution =
                 Feature.POST_APPLICABILITY_VARARGS_ACCESS_CHECK.allowedInSource(source);
         polymorphicSignatureScope = WriteableScope.create(syms.noSymbol);

src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavacParser.java

@@ -183,8 +183,7 @@ protected JavacParser(ParserFactory fac,
         this.keepLineMap = keepLineMap;
         this.errorTree = F.Erroneous();
         endPosTable = newEndPosTable(keepEndPositions);
-        this.allowYieldStatement = (!preview.isPreview(Feature.SWITCH_EXPRESSION) || preview.isEnabled()) &&
-                Feature.SWITCH_EXPRESSION.allowedInSource(source);
+        this.allowYieldStatement = Feature.SWITCH_EXPRESSION.allowedInSource(source);
         this.allowRecords = Feature.RECORDS.allowedInSource(source);
         this.allowSealedTypes = Feature.SEALED_CLASSES.allowedInSource(source);
     }