Fix false positive "Foldable if-then" with Result type

#KT-27074 Fixed

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

@@ -0,0 +1,11 @@
+// DISABLE-ERRORS
+class Result<T> {
+    fun getOrNull(): Any = TODO()
+}
+val someNullableString: String? = ""
+fun String.bar(): Result<String> = Result.success("")
+val result = if<caret> (someNullableString == null) {
+    null
+} else {
+    someNullableString.bar().getOrNull().let { }
+}

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

@@ -0,0 +1,7 @@
+// DISABLE-ERRORS
+class Result<T> {
+    fun getOrNull(): Any = TODO()
+}
+val someNullableString: String? = ""
+fun String.bar(): Result<String> = Result.success("")
+val result = someNullableString?.bar()?.getOrNull()?.let { }

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

@@ -0,0 +1,11 @@
+// PROBLEM: none
+// WITH_RUNTIME
+// DISABLE-ERRORS
+
+val someNullableString: String? = ""
+fun String.bar(): Result<String> = Result.success("")
+val result = if<caret> (someNullableString == null) {
+    null
+} else {
+    someNullableString.bar().getOrNull().let { }
+}

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

@@ -0,0 +1,10 @@
+// DISABLE-ERRORS
+// WITH_RUNTIME
+
+val someNullableString: String? = ""
+fun String.bar(): Result<String> = Result.success("")
+val result = if<caret> (someNullableString == null) {
+    null
+} else {
+    someNullableString.bar()
+}

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

@@ -0,0 +1,6 @@
+// DISABLE-ERRORS
+// WITH_RUNTIME
+
+val someNullableString: String? = ""
+fun String.bar(): Result<String> = Result.success("")
+val result = someNullableString?.bar()