[5.1] [ModuleInterface] Pass -Rmodule-interface-rebuild to sub-invocation #24740
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Previously, we wouldn't pass this flag to sub-invocations, which means
that if we had to fall back and recompile a transitive import, we
wouldn't get a remark.
rdar://50729662
Cherry-pick of #24737 to 5.1 branch. Reviewed by @jrose-apple.