FIR (raw / resolution API): set correctly elvis/bang-bang bound PSIs

idea/testData/fir/lazyResolve/elvis/elvis.test

@@ -0,0 +1,3 @@
+{
+  "mainFile": "main.kt"
+}

idea/testData/fir/lazyResolve/elvis/main.kt

@@ -0,0 +1,7 @@
+package elvis
+
+class WithElvis(val value: String?) {
+    fun foo() = <caret>value ?: ""
+}
+
+

idea/testData/fir/lazyResolve/elvis/main.txt

@@ -0,0 +1,22 @@
+FILE: main.kt
+    public final class WithElvis : R|kotlin/Any| {
+        public constructor(value: R|kotlin/String?|): R|elvis/WithElvis| {
+            super<R|kotlin/Any|>()
+        }
+
+        public final val value: R|kotlin/String?| = R|<local>/value|
+            public get(): R|kotlin/String?|
+
+        public final fun foo(): R|kotlin/String| {
+            ^foo when (lval <elvis>: R|kotlin/String?| = R|elvis/WithElvis.value|) {
+                ==($subj$, Null(null)) ->  {
+                    String()
+                }
+                else ->  {
+                    R|<local>/<elvis>|!
+                }
+            }
+
+        }
+
+    }

idea/testData/fir/lazyResolve/elvis/results.txt

@@ -0,0 +1 @@
+R|elvis/WithElvis.value|