[llvm] [SPIR-V] Fix type mismatch in scalar-to-vector promotion for mixed-type builtins (PR #190969)

[Marcos Maronas via llvm-commits]

================
@@ -1,6 +1,7 @@
 ;; Check that backend converts scalar arg to vector for ldexp math instructions
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maarquitos14 wrote:

```suggestion
;; Check that backend converts scalar arg to vector for ldexp math instructions.
```

I know it's not added by this PR, but while we're here...

https://github.com/llvm/llvm-project/pull/190969