Handle implicit receivers more accurately in if-then to safe access

#KT-26599 Fixed

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/replaceWithLetInMember.kt

@@ -0,0 +1,14 @@
+// HIGHLIGHT: INFORMATION
+// WITH_RUNTIME
+
+class Test {
+    fun doAThing(param1: String) {
+
+    }
+
+    fun doAThingIfPresent(param1: String?) {
+        <caret>if (param1 != null) {
+            doAThing(param1)
+        }
+    }
+}

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/replaceWithLetInMember.kt.after

@@ -0,0 +1,12 @@
+// HIGHLIGHT: INFORMATION
+// WITH_RUNTIME
+
+class Test {
+    fun doAThing(param1: String) {
+
+    }
+
+    fun doAThingIfPresent(param1: String?) {
+        param1?.let { doAThing(it) }
+    }
+}

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/replaceWithLetInMemberWithIs.kt

@@ -0,0 +1,14 @@
+// HIGHLIGHT: INFORMATION
+// WITH_RUNTIME
+
+class Test {
+    fun doAThing(param1: String) {
+
+    }
+
+    fun doAThingIfPresent(param1: String?) {
+        <caret>if (param1 is String) {
+            doAThing(param1)
+        }
+    }
+}

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/replaceWithLetInMemberWithIs.kt.after

@@ -0,0 +1,12 @@
+// HIGHLIGHT: INFORMATION
+// WITH_RUNTIME
+
+class Test {
+    fun doAThing(param1: String) {
+
+    }
+
+    fun doAThingIfPresent(param1: String?) {
+        (param1 as? String)?.let { doAThing(it) }
+    }
+}