Remove -disable-experimental-parser-round-trip from a test

Author: meg-gupta

test/SILOptimizer/lifetime_dependence_closure.swift

@@ -3,7 +3,6 @@
 // RUN:   -verify \
 // RUN:   -sil-verify-all \
 // RUN:   -module-name test \
-// RUN:   -disable-experimental-parser-round-trip \
 // RUN:   -enable-experimental-feature NoncopyableGenerics \
 // RUN:   -enable-experimental-feature NonescapableTypes