[NI] Finish analysis for coerced last lambda expressions if needed

compiler/testData/codegen/box/inference/coercionToUnitWithLastLambdaExpression.kt

@@ -0,0 +1,35 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+
+fun <T> myRun(action: () -> T): T = action()
+fun foo(): String = "foo"
+
+fun <K> materialize(): K {
+    result += "K"
+    return "str" as K
+}
+
+var result = "fail"
+
+fun test1(n: Number, b: Boolean) {
+    n.let {
+        if (b) return@let
+
+        myRun {
+            result = "O"
+            foo()
+        }
+    }
+}
+
+fun test2(n: Number, b: Boolean) {
+    n.let {
+        if (b) return@let
+        materialize()
+    }
+}
+
+fun box(): String {
+    test1(42, false)
+    test2(42, false)
+    return result
+}