Undeprecate VariableDescriptorWithAccessors.isDelegated

Apparently there's quite a few valid usages of this method outside of
the compiler frontend, where manual suppression is annoying.

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/checkers/JvmArrayVariableInLoopAssignmentChecker.kt

@@ -31,7 +31,6 @@ import org.jetbrains.kotlin.resolve.calls.callUtil.getResolvedCall
 import org.jetbrains.kotlin.resolve.calls.checkers.AdditionalTypeChecker
 import org.jetbrains.kotlin.resolve.calls.context.ResolutionContext
 import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowValue
-import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowValueFactory
 import org.jetbrains.kotlin.resolve.jvm.diagnostics.ErrorsJvm
 import org.jetbrains.kotlin.types.KotlinType
 
@@ -52,7 +51,6 @@ object JvmArrayVariableInLoopAssignmentChecker : AdditionalTypeChecker {
         val resolvedCall = lhsExpression.getResolvedCall(c.trace.bindingContext) ?: return
         val variableDescriptor = resolvedCall.resultingDescriptor as? LocalVariableDescriptor ?: return
         if (variableDescriptor is SyntheticFieldDescriptor) return
-        @Suppress("DEPRECATION")
         if (variableDescriptor.isDelegated) return
 
         val variableType = variableDescriptor.returnType

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/checkers/JvmMultifileClassStateChecker.kt

@@ -27,7 +27,7 @@ object JvmMultifileClassStateChecker : DeclarationChecker {
 
         if (!JvmFileClassUtil.getFileClassInfoNoResolve(declaration.containingKtFile).withJvmMultifileClass) return
 
-        if (@Suppress("DEPRECATION") descriptor.isDelegated ||
+        if (descriptor.isDelegated ||
             context.trace.bindingContext.get(BindingContext.BACKING_FIELD_REQUIRED, descriptor) == true) {
             context.trace.report(ErrorsJvm.STATE_IN_MULTIFILE_CLASS.on(declaration))
         }