Don't highlight 'this' references as deprecated

#KT-17613 Fixed

compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/DeprecatedClassifierUsageChecker.kt

@@ -19,6 +19,7 @@ package org.jetbrains.kotlin.resolve.checkers
 import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.config.LanguageVersionSettings
 import org.jetbrains.kotlin.descriptors.ClassifierDescriptor
+import org.jetbrains.kotlin.psi.KtThisExpression
 import org.jetbrains.kotlin.resolve.BindingTrace
 import org.jetbrains.kotlin.resolve.createDeprecationDiagnostic
 import org.jetbrains.kotlin.resolve.getDeprecations
@@ -30,6 +31,7 @@ class DeprecatedClassifierUsageChecker : ClassifierUsageChecker {
             element: PsiElement,
             languageVersionSettings: LanguageVersionSettings
     ) {
+        if (element.parent is KtThisExpression) return
         for (deprecation in targetDescriptor.getDeprecations(languageVersionSettings)) {
             trace.report(createDeprecationDiagnostic(element, deprecation, languageVersionSettings))
         }