Add inspection to detect is checks for object types #KT-21741 Fixed

idea/testData/inspectionsLocal/redundantObjectTypeCheck/.inspection

@@ -0,0 +1 @@
+org.jetbrains.kotlin.idea.inspections.RedundantObjectTypeCheckInspection

idea/testData/inspectionsLocal/redundantObjectTypeCheck/isClass.kt

@@ -0,0 +1,7 @@
+// PROBLEM: none
+class C
+
+fun foo(arg: Any) {
+    if (arg <caret>is C) {
+    }
+}

idea/testData/inspectionsLocal/redundantObjectTypeCheck/isClassWhenEntry.kt

@@ -0,0 +1,9 @@
+// PROBLEM: none
+class C
+
+fun foo(arg: Any) {
+    when (arg) {
+        <caret>is C -> {
+        }
+    }
+}

idea/testData/inspectionsLocal/redundantObjectTypeCheck/isNotObject.kt

@@ -0,0 +1,6 @@
+object O
+
+fun foo(arg: Any) {
+    if (arg <caret>!is O) {
+    }
+}

idea/testData/inspectionsLocal/redundantObjectTypeCheck/isNotObject.kt.after

@@ -0,0 +1,6 @@
+object O
+
+fun foo(arg: Any) {
+    if (arg != O) {
+    }
+}

idea/testData/inspectionsLocal/redundantObjectTypeCheck/isNotObjectWhenEntry.kt

@@ -0,0 +1,9 @@
+// PROBLEM: none
+object O
+
+fun foo(arg: Any) {
+    when (arg) {
+        <caret>!is O -> {
+        }
+    }
+}

idea/testData/inspectionsLocal/redundantObjectTypeCheck/isObject.kt

@@ -0,0 +1,6 @@
+object O
+
+fun foo(arg: Any) {
+    if (arg <caret>is O) {
+    }
+}

idea/testData/inspectionsLocal/redundantObjectTypeCheck/isObject.kt.after

@@ -0,0 +1,6 @@
+object O
+
+fun foo(arg: Any) {
+    if (arg == O) {
+    }
+}

idea/testData/inspectionsLocal/redundantObjectTypeCheck/isObjectWhenEntry.kt

@@ -0,0 +1,8 @@
+object O
+
+fun foo(arg: Any) {
+    when (arg) {
+        <caret>is O -> {
+        }
+    }
+}

idea/testData/inspectionsLocal/redundantObjectTypeCheck/isObjectWhenEntry.kt.after

@@ -0,0 +1,8 @@
+object O
+
+fun foo(arg: Any) {
+    when (arg) {
+        O -> {
+        }
+    }
+}