FIR CFG: process called-in-place lambdas as loops

compiler/testData/diagnostics/tests/smartCasts/varnotnull/varCapturedInInlineClosure.fir.kt

@@ -0,0 +1,16 @@
+// See also KT-7186 and forEachSafe.kt
+// Custom `forEach` has no contract but the lambda is inline (not crossinline) so smart cast is safe
+
+inline fun IntArray.forEachIndexed( op: (i: Int, value: Int) -> Unit) {
+    for (i in 0..this.size)
+        op(i, this[i])
+}
+
+fun max(a: IntArray): Int? {
+    var maxI: Int? = null
+    a.forEachIndexed { i, value ->
+        if (maxI == null || value >= a[maxI])
+            maxI = i
+    }
+    return maxI
+}