[CIR][NFC] Fix build problems with [[maybe_unused]] (#143994)
A recent commit introduced the use of [[maybe_unused]] following
LLVM_PREFFERED_TYPE(bool) on a member variable declaration. I compiled
it with clang 14.0, which doesn't support the `preferred_type` attribute
so I didn't notice a problem. However, starting with clang 18.0, this
reports an error ("an attribute list cannot appear here") because of the
mixing of attribute styles.
This change fixes the problem by replacing [[maybe_unused]] with
LLVM_ATTRIBUTE_UNUSED.
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