[clang] [clang] Allow parentheses around CTAD declarators (PR #132829)

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Sirraide wrote:

CC @Endilll Should this also add a test to [cwg23xx.cpp](https://github.com/llvm/llvm-project/blob/main/clang/test/CXX/drs/cwg23xx.cpp)?



https://github.com/llvm/llvm-project/pull/132829