[gn build] port b2a162e63bd73 (liblldb.dll)This requires making liblldb a dll on Windows.Things still work with a static lib on non-Windows, so keep it astatic lib there for now.
[gn build] (manually) port ccf1469a4cdb (lldbVersion)
[gn build] Add build files for LLDBThis is enough to get the lit-based tests to pass on macOS.Doesn't yet add build targets for:- Any LLDB unit tests- swig bindings- various targets not needed
[gn build] Add build files for LLDBThis is enough to get the lit-based tests to pass on macOS.Doesn't yet add build targets for:- Any LLDB unit tests- swig bindings- various targets not needed by lit testsLLDB has many dependency cycles, something GN doesn't allow. Forthat reason, I've omitted some dependency edges. Hopefully we canclean up the cycles one day.LLDB has a public/private header distinction, but mostly ignores it.Many libraries include private headers from other modules.Since LLDB is the first target the LLVM/GN build that uses Objective-C++code, add some machinery to the toolchain file to handle that.Differential Revision: https://reviews.llvm.org/D109185
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