[libcxx-commits] [libcxx] [libcxx] Enable '-fdelayed-template-parsing' for clang-cl libcxx tests (PR #70092)

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EricWF wrote:

If I recall correctly `-fdelayed-template-parsing` puts the compiler into a non-conforming mode. And MSVC  now defaults to `-fno-delayed-template-parsing` now.

Does libc++ want to support a non-conforming, legacy, MSVC extension?

https://github.com/llvm/llvm-project/pull/70092