[clang] [Clang][CodeGen] Do not promote if complex divisor is real (PR #131451)

[Mészáros Gergely via cfe-commits]

Maetveis wrote:

### Merge activity

* **Mar 19, 2:22 AM EDT**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/131451).


https://github.com/llvm/llvm-project/pull/131451