Add fib test to FIR resolve tests

compiler/fir/resolve/testData/resolve/fib.kt

@@ -0,0 +1,11 @@
+fun fibIterative(n: Int): Int {
+    if (n < 2) return 1
+    var current = 1
+    var prev = 1
+    for (i in 2..n) {
+        val temp = current
+        current += prev
+        prev = temp
+    }
+    return current
+}

compiler/fir/resolve/testData/resolve/fib.txt

@@ -0,0 +1,23 @@
+FILE: fib.kt
+    public final fun fibIterative(n: R|kotlin/Int|): R|kotlin/Int| {
+        when () {
+            <(R|<local>/n|, Int(2)) ->  {
+                ^fibIterative Int(1)
+            }
+            else ->  {
+            }
+        }
+
+        lvar current: R|kotlin/Int| = Int(1)
+        lvar prev: R|kotlin/Int| = Int(1)
+        lval <range>: R|kotlin/ranges/IntRange| = Int(2).R|kotlin/Int.rangeTo|(R|<local>/n|)
+        lval <iterator>: R|kotlin/collections/IntIterator| = R|<local>/<range>|.R|kotlin/ranges/IntProgression.iterator|()
+        while(R|<local>/<iterator>|.R|FakeOverride<kotlin/collections/Iterator.hasNext: R|kotlin/Boolean|>|()) {
+            lval i: R|kotlin/Int| = R|<local>/<iterator>|.R|kotlin/collections/IntIterator.next|()
+            lval temp: R|kotlin/Int| = R|<local>/current|
+            R|<local>/current| += R|<local>/prev|
+            R|<local>/prev| = R|<local>/temp|
+        }
+
+        ^fibIterative R|<local>/current|
+    }

compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/FirResolveTestCaseGenerated.java

@@ -64,6 +64,11 @@ public class FirResolveTestCaseGenerated extends AbstractFirResolveTestCase {
         runTest("compiler/fir/resolve/testData/resolve/fakeRecursiveTypealias.kt");
     }
 
+    @TestMetadata("fib.kt")
+    public void testFib() throws Exception {
+        runTest("compiler/fir/resolve/testData/resolve/fib.kt");
+    }
+
     @TestMetadata("ft.kt")
     public void testFt() throws Exception {
         runTest("compiler/fir/resolve/testData/resolve/ft.kt");