[llvm] [lldb] DEBUGINFOD based DWP acquisition for LLDB (PR #70996)

[Kevin Frei via llvm-commits]

kevinfrei wrote:

> > This change broke building against LLVM dylib:
> > ```
> > /usr/lib/gcc/x86_64-pc-linux-gnu/13/../../../../x86_64-pc-linux-gnu/bin/ld: cannot find -lLLVMDebuginfod: No such file or directory
> > collect2: error: ld returned 1 exit status
> > samu: subcommand failed
> > ```
> > 
> > 
> >     
> >       
> >     
> > 
> >       
> >     
> > 
> >     
> >   
> > Full build log: [dev-util:lldb-18.0.0_pre20231206:20231206-163149.log](https://github.com/llvm/llvm-project/files/13588891/dev-util.lldb-18.0.0_pre20231206.20231206-163149.log)
> 
> @mgorny Can you please point me at where to find all the configuration for those builds? I'm stuck on a weirdo CentOS build (or MacOS) and can't manage to get my CMake configuration stuff to let me build a dylib/so. I'll get on this first thing tomorrow.


> This change broke building against LLVM dylib:
> 
> ```
> /usr/lib/gcc/x86_64-pc-linux-gnu/13/../../../../x86_64-pc-linux-gnu/bin/ld: cannot find -lLLVMDebuginfod: No such file or directory
> collect2: error: ld returned 1 exit status
> samu: subcommand failed
> ```
> 
> Full build log: [dev-util:lldb-18.0.0_pre20231206:20231206-163149.log](https://github.com/llvm/llvm-project/files/13588891/dev-util.lldb-18.0.0_pre20231206.20231206-163149.log)

@mgorny I've burned 3 hours this morning trying to get the visible configuration flags from that log file to function _before_ my patch on (my weirdo CentOS 9) Linux box, or cause problems _after_ my patch on macOS, and failed on both fronts. I'm stuck until you can get me the contents of `gentoo_common_config.cmake` (or tell me where to find it...)

https://github.com/llvm/llvm-project/pull/70996