Revert "Make STLExtras's (all|any|none)_of() Utility Functions Constexpr-Friendly" (#173163)
Reverts llvm/llvm-project#172536. This is causing weird assertion
failures in clang, per
https://github.com/llvm/llvm-project/pull/172536#issuecomment-3677973154.
It might be a bug in GCC, but still makes sense to revert it in the
interest of bootstrapping.
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Signed-off-by: Michał Górny <mgorny@gentoo.org>