Jim Ingham f3ecbfc164 Add UUID::SetFromOptionalStringRef, use it in DynamicLoaderDarwin ...

We use UUID::fromOptionalData to read UUID's from the Mach-O files, so UUID's
of all 0's are invalid UUID's.
We also get uuid's from debugserver, which need to match the file UUID's.  So
we need an API that treats "000000000" as invalid as well.  Added that and use it.

Differential Revision: https://reviews.llvm.org/D57195

llvm-svn: 352122

2019-01-24 22:43:44 +00:00

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