Duncan P. N. Exon Smith f2b7d9f7fa Support: Allow use of MemoryBufferRef with line_iterator ...

Split out from https://reviews.llvm.org/D66782, use `Optional<MemoryBufferRef>`
in `line_iterator` so you don't need access to a `MemoryBuffer*`.  Follow up
patches in `clang/` will leverage this.

Differential Revision: https://reviews.llvm.org/D89280

2020-10-13 16:43:49 -04:00

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