Swift/Ninja: Fix missing OFM in CMP0157 OLD behavior
The CMP0157 old behavior omitted the output-file-map after the Swift
build split because we stopped calling EmitSwiftDependencyInfo
when we
could not split the build because we didn't call
WriteObjectBuildStatement
. If we can't split the build, then we still
need to include the OFM information to not break incremental builds.
This bug has not been part of a release build yet.
Topic-rename: swift-CMP0157-old
Edited by Brad King