[Macro] Fix bugs in macro dependency scanning #75082
Merged
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Fix few issues from previous implementation from explicit module build with macros and accurate macro dependency scanning in #73421.
First, there is a crash when propagating the macro dependencies. It turns out that the current macro plugin implementation doesn't need the downstream users to know about the plugin search path from the upstream dependencies.
Secondly, fix a bug that the swiftinterface that has macro usage won't build because the build command doesn't inherit the plugin search path option.
Finally, add JSON output for macro dependencies so it is easier to debug the macro dependencies.
rdar://131214106