[clang] [clang] Prevent nested RecoveryExpr in BuildConvertedConstantExpression (PR #207072)

[Matheus Izvekov via cfe-commits]

https://github.com/mizvekov commented:

The functional changes look good.

Can you add these test cases to an existing test file instead of creating new ones for each?

https://github.com/llvm/llvm-project/pull/207072