Has platform type : public API only option

(cherry picked from commit a084c1d)

idea/testData/inspections/hasPlatformType/function.kt

@@ -1,3 +1,9 @@
 // WITH_RUNTIME
 
-fun foo() = java.lang.String.valueOf(1)
+fun foo() = java.lang.String.valueOf(1)
+
+private fun foo() = java.lang.String.valueOf(2)
+
+open class My {
+    protected fun foo() = java.lang.String.valueOf(3)
+}

idea/testData/inspections/hasPlatformType/inspectionData/expected.xml

@@ -7,6 +7,14 @@
         <problem_class severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Function, property or variable has platform type.</problem_class>
         <description>Function has platform type. Make the type explicit to prevent subtle bugs.</description>
     </problem>
+    <problem>
+        <file>function.kt</file>
+        <line>8</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="temp:///src/function.kt" />
+        <problem_class severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Function or property has platform type</problem_class>
+        <description>Function has platform type. Make the type explicit to prevent subtle bugs.</description>
+    </problem>
     <problem>
         <file>property1.kt</file>
         <line>3</line>