Ashley Garland be77d57121 SymbolGraph: Serialize decl and raw comment locations ...

- Add DocRangesLayout to the `.swiftsourceinfo`.
  This is a blob containing an array of `SingleRawComment`
  source locations.

- Add DocLocWriter for serializing `SingleRawComment` locs into the
  `DocLocsLayout` buffer.
  Serialize start line, start column, and length of `SingleRawComment`
  pieces in `.swiftsourceinfo`

- Read doc locs when loading basic declaration locs from a ModuleFile.
  - Load `DOC_LOCS` blob into ModuleFile::DocLocsData
  - Reconstitute RawComment ranges when available from .swiftsourceinfo

- Allow requesting serialized raw comment if available

rdar://problem/58339492

2020-02-17 16:20:59 -08:00

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