Improve search for facade light class by kotlin file

LightClassUtil#getWrappingClass works for clashing facade fq names

 #KT-17855 Fixed

idea/testData/multiFileInspections/mainInTwoModules/before/A/src/part1A.kt

@@ -0,0 +1,8 @@
+@file:JvmName("MultiPart")
+@file:JvmMultifileClass
+
+package test.multiPart
+
+fun main(args: Array<String>) {
+
+}

idea/testData/multiFileInspections/mainInTwoModules/before/A/src/part2A.kt

@@ -0,0 +1,9 @@
+@file:JvmName("MultiPart")
+@file:JvmMultifileClass
+
+package test.multiPart
+
+fun other() {
+
+}
+

idea/testData/multiFileInspections/mainInTwoModules/before/A/src/simpleMain.kt

@@ -1,3 +1,5 @@
+package simple
+
 fun main(args: Array<String>) {
 
 }

idea/testData/multiFileInspections/mainInTwoModules/before/B/src/part1B.kt

@@ -0,0 +1,8 @@
+@file:JvmName("MultiPart")
+@file:JvmMultifileClass
+
+package test.multiPart
+
+fun other() {
+
+}

idea/testData/multiFileInspections/mainInTwoModules/before/B/src/part2B.kt

@@ -0,0 +1,8 @@
+@file:JvmName("MultiPart")
+@file:JvmMultifileClass
+
+package test.multiPart
+
+fun main(args: Array<String>) {
+
+}

idea/testData/multiFileInspections/mainInTwoModules/before/B/src/simpleMain.kt

@@ -1,3 +1,5 @@
+package simple
+
 fun main(args: Array<String>) {
 
 }

idea/testData/multiFileInspections/mainInTwoModules/expected.xml

@@ -1,3 +1,17 @@
 <problems>
+    <problem>
+        <file>part2A.kt</file>
+        <line>6</line>
+        <entry_point TYPE="file" FQNAME="part2A.kt" />
+        <problem_class severity="WARNING" attribute_key="NOT_USED_ELEMENT_ATTRIBUTES">Unused symbol</problem_class>
+        <description>Function ''other'' is never used</description>
+    </problem>
 
+    <problem>
+        <file>part1B.kt</file>
+        <line>6</line>
+        <entry_point TYPE="file" FQNAME="part1B.kt" />
+        <problem_class severity="WARNING" attribute_key="NOT_USED_ELEMENT_ATTRIBUTES">Unused symbol</problem_class>
+        <description>Function ''other'' is never used</description>
+    </problem>
 </problems>