[Incremental] Improve printing for debugging #507
Merged
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When printing out swiftdeps and swiftmodules for the debugging remarks and in the dot graphs, just use the basename of the swiftdeps and the parent-directory of the swiftmodules. (Because every swiftmodule has the same basename, the parent carries the info.)
Also, get the source name for a
SourceFileDependencyGraph
from itsDependencySource
, which is statically guaranteed to be present.