[clang] [clang][index][USR] GenLoc prints file entry at most once, allow repeated offsets (PR #205430)

[Ziqing Luo via cfe-commits]

ziqingluo-90 wrote:

> Hello, it seems this PR breaks our bot. Could you please take a look? Thanks!
> 
> bot: https://lab.llvm.org/buildbot/#/builders/10/builds/30742
> 
> ```
> /usr/bin/ld: /home/botworker/builds/openmp-offload-amdgpu-runtime-2/build/llvm.build/lib/libclangUnifiedSymbolResolution.so.23.0git: error adding symbols: DSO missing from command line
> ```

Will merge https://github.com/llvm/llvm-project/pull/205954 once tests are done.

https://github.com/llvm/llvm-project/pull/205430