[Bridging PCH] Only emit deps for CompileJobActions rdar://31016087 #8097
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Undo a bug (accidentally introduced in #7944 / fae468f) wherein we generate
.d
and.swiftdeps
files for bridging PCH steps. The presence of these breaks an invariant that onlyCompileJobAction
s are supposed to have such depfiles, which in turn causes an attemptedcast
to go wrong. This bad cast traps in an assertions-build. In non-assertions builds it's a UMR that may cause a miscompile.rdar://31016087