swift234

[driver] Updated OutputInfo with a ShouldTreatModuleAsTopLevelOutput field.

This will indicate that the generated module was user-requested, so it should be
placed alongside other outputs.

Updated buildOutputInfo() in a few ways:
  - Updated it to set ShouldTreatModuleAsTopLevelOutput correctly.
  - Updated it such that -g implies that a module should be generated, but treated as an intermediate.
  - Moved the fallback ModuleName handling into buildOutputInfo(), which requires passing an InputList.

Swift SVN r12502