Zachary Turner 5c725f3a06 Convert 3 more functions to use a StringRef. ...

This converts Args::Unshift, Args::AddOrReplaceEnvironmentVariable,
and Args::ContainsEnvironmentVariable to use StringRefs.  The code
is also simplified somewhat as a result.

llvm-svn: 281942

2016-09-19 21:56:59 +00:00

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