Rename: Add quotes to declaration name if necessary

#KT-22708 Fixed

compiler/frontend/src/org/jetbrains/kotlin/psi/KtNamedDeclarationStub.java

@@ -104,7 +104,8 @@ abstract class KtNamedDeclarationStub<T extends KotlinStubWithFqName<?>> extends
             }
         }
 
-        PsiElement newIdentifier = KtPsiFactory(this).createNameIdentifierIfPossible(name);
+        PsiElement newIdentifier =
+                KtPsiFactory(this).createNameIdentifierIfPossible(KtPsiUtilKt.quoteIfNeeded(name));
         if (newIdentifier != null) {
             KtPsiUtilKt.astReplace(identifier, newIdentifier);
         }

idea/testData/refactoring/rename/inplace/AddQuotes.kt

@@ -0,0 +1,5 @@
+fun <caret>foo() {}
+
+fun main(args: Array<String>) {
+    foo()
+}

idea/testData/refactoring/rename/inplace/AddQuotes.kt.after

@@ -0,0 +1,5 @@
+fun `is`() {}
+
+fun main(args: Array<String>) {
+    `is`()
+}

idea/tests/org/jetbrains/kotlin/idea/refactoring/InplaceRenameTest.kt

@@ -110,6 +110,10 @@ class InplaceRenameTest : LightPlatformCodeInsightTestCase() {
         doTestMemberInplaceRename("plus")
     }
 
+    fun testAddQuotes() {
+        doTestMemberInplaceRename("is")
+    }
+
     private fun doTestImplicitLambdaParameter(newName: String) {
         configureByFile(getTestName(false) + ".kt")