[clang] [Clang][Interpreter] Enable PIC to avoid 32-bit relocation overflows (PR #201286)

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aokblast wrote:

> Drive-by: the PR description no longer matches the implementation. The PICLevelReader stuff looks strange, but I don't have time to take a closer look.

I think you want me to insert PIC check in building pcm and pch. But I don't find a good place to insert such check or add callback in CompilerInstance and its callee.

https://github.com/llvm/llvm-project/pull/201286