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

compiler/testData/diagnostics/testsWithStdLib/smartcasts/forEachSafe.fir.kt

@@ -0,0 +1,12 @@
+// See also KT-7186 and varCapturedInInlineClosure.kt
+// Standard library `forEach` calls lambda in-place by contract so smart cast is safe
+
+fun indexOfMax(a: IntArray): Int? {
+    var maxI: Int? = null
+    a.forEachIndexed { i, value ->
+        if (maxI == null || value >= a[maxI]) {
+            maxI = i
+        }
+    }
+    return maxI
+}

compiler/testData/diagnostics/testsWithStdLib/smartcasts/forEachSafe.kt

@@ -1,5 +1,5 @@
-// FIR_IDENTICAL
-// KT-7186: False "Type mismatch" error
+// See also KT-7186 and varCapturedInInlineClosure.kt
+// Standard library `forEach` calls lambda in-place by contract so smart cast is safe
 
 fun indexOfMax(a: IntArray): Int? {
     var maxI: Int? = null