Bob Wilson 3fd92f82e8 Use StringRef in more places to match recent llvm changes. ...

llvm r283043 and possibly other recent changes switch to use StringRef
instead of char* pointers. Update Swift to match. In some cases, this is
a clear improvement. It would be good to assess the impact on memory use,
particularly for the Filename component of source locations.

Note that the change to SILLocation::isNull fixes an apparent bug where
the location was treated as null when the filename was *not* null.

2016-10-15 11:02:07 -07:00

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