Support extension lambda inlining in complex stack cases (nullable receiver)

compiler/testData/codegen/boxInline/compexStack/simpleExtension.1.kt

@@ -0,0 +1,5 @@
+import test.*
+
+fun box(): String? {
+    return processRecords("O") { this + "K" }
+}

compiler/testData/codegen/boxInline/compexStack/simpleExtension.2.kt

@@ -0,0 +1,5 @@
+package test
+
+inline fun foo(x: String) = x
+
+inline fun processRecords(s: String?, block: String.(String) -> String) = s?.block(foo("O"))