KT-5248 Don't wrap variable if it is captured only in inlined closures

Remove non-escaping Ref's on bytecode postprocessing pass.

compiler/testData/codegen/box/closures/capturedVarsOptimization/capturedInInlineOnlyAssign.kt

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+
+fun box(): String {
+    var x = ""
+    run { x = "OK" }
+    return x
+}