[5.9][Macros] Serialize plugin search paths for LLDB use #65616
Merged
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Write down the plugin search paths in the binary swiftmodule files so LLDB can load them and understand the macros in the expression evaluator. This may list local search paths as expected for debugging locally built modules, however LLDB may want to ignore these paths when read from a distributed swiftmodule file.
Risk: Low, the information will only be read by LLDB. There's no need to bump the swiftmodule format version.
Scope: Macro support in LLDB.
Reviewer: @rintaro
rdar://107030743
Cherry-pick of #65370.