[clang] [Clang] Support libstdc++ workarounds when using `-E` (PR #210802)

[Corentin Jabot via cfe-commits]

cor3ntin wrote:

It **shouldn’t** - exactly like you did, e.g just calling setStdLibCxxVersion 
is a good solution

https://github.com/llvm/llvm-project/pull/210802
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