Pete Cooper b08d9060b7 StringRef::copy shouldn't allocate anything for length 0 strings. ...

The BumpPtrAllocator currently doesn't handle zero length allocations well.
The discussion for how to fix that is ongoing.  However, there's no need
for StringRef::copy to actually allocate anything here anyway, so just
return StringRef() when we get a zero length copy.

Reviewed by David Blaikie

llvm-svn: 264201

2016-03-23 21:49:31 +00:00

20 KiB

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