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

[Kewen Meng via cfe-commits]

Kewen12 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
```

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