George Burgess IV a0082afcb6 [ModuleSummary] use StringRefs to avoid a redundant copy; NFC ...

`Saver` is a StringSaver, which has a few overloads of `save` that all
ultimately just call `StringRef save(StringRef)`. Just take a StringRef
here instead of building up a std::string to convert it to a StringRef.

llvm-svn: 348650

2018-12-07 21:47:32 +00:00

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