[clang] [LinkerWrapper] Fix -fsave-optimization-record default file (PR #149003)

[Joel E. Denny via cfe-commits]

jdenny-ornl wrote:

> > So we = clang-linker-wrapper? Yes, we could. But I figured this problem might prove not to be a one-off, and -foutput-file-base is a more general solution that could be used elsewhere.
> 
> I'm just hesitant to add a new flag that's used just for this (Though I've done similar hacks in the past.) I'll add some more clang people to get their opinion.

Thanks.  Looking through clang/lib/Driver/ToolChains/CommonArgs.cpp, I see other places where the main output file appears to be used to compute new file names (OPT_gsplit_dwarf, getStatsFileName).  I'm not familiar with those features, and I haven't investigated them specifically yet to prove the same problem arises.  Maybe someone else already knows.

https://github.com/llvm/llvm-project/pull/149003