[clang] [Clang][NFC] Extend cmplx range tests for #131129 (PR #131447)

[Mészáros Gergely via cfe-commits]

Maetveis wrote:

> > This is a lot of tests... do we really need every combination of type/operator/flag? I guess it makes sure we don't have gaps, but thousands of lines of tests seems excessive.
> 
> It does seem like a lot of testing, but I'd rather we be excessive than take our historical approach of only getting a fraction of test coverage.

I've reduced the testing somewhat, given that there is no expected difference in basic/improved/full handling for most of `complex-range-real.c` I cut out basic. Also removed most of multiply testing since there should be no difference in modes between them.

I think including the full function without optimizations is contributing to the verbosity. The gep/load/store sequences are not really interesting for these tests. I can experiment with `--filter-out`, but I'd prefer to do that as a followup.



https://github.com/llvm/llvm-project/pull/131447