Richard Smith 37a93df3d5 [modules] Load the ModuleOffsetMap from the module header lazily. ...

If we never need to map any ID within the module to its global ID, we don't
need the module offset map. If a compilation transitively depends on lots of
unused module files, this can result in a modest performance improvement.

llvm-svn: 295517

2017-02-18 00:32:02 +00:00

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