[clang] Default to -fno-sized-deallocation for AIX (#97076) Some `libc++` LIT test cases and user code define their own version of `operator delete` that are not sized. With `-fno-sized-deallocation`, destructors call the non-sized `operator delete` and it will be resolved to the user defined version. However, with `-fsized-deallocation`, destructors will call the sized `operator delete` which will be resolved to the weak definition in `libc++abi` because the user code does not define the corresponding sized version. The `libc++abi` sized `operator delete` in turn calls the non-sized version of `operator delete` of the same shared object inside `libc++abi` instead of the user defined version on AIX because runtime linking is not the default for AIX and therefore, fails the tests or user code. This patch sets `-fno-sized-deallocation` as the default for AIX if neither `-fsize-deallocation` nor `-fno-sized-deallocation` is explicitly set, similar to what is done for ZOS.
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