[clang] [clang] Add explicit std::move(...) to avoid a few copies (PR #180482)

[Timm Baeder via cfe-commits]

================
@@ -404,7 +404,7 @@ void RecursiveCloneTypeIIHashConstraint::constrain(
     }
   }
   // Sequences is the output parameter, so we copy our result into it.
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tbaederr wrote:

```suggestion
  // Sequences is the output parameter, so we move our result into it.
```
? :)

https://github.com/llvm/llvm-project/pull/180482