[clang] [llvm] [PowerPC] Support for Packed BCD conversion builtins (PR #142723)

[via llvm-commits]

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+// Testfile for negative condition for BCD builtins national2packed, packed2zoned and zoned2packed.
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Himadhith wrote:

Okay it does seem redundant, I will remove the negative test case file and keep `clang/test/Sema/builtins-bcd-transform.c` to check for semantics along with the check for error. 

https://github.com/llvm/llvm-project/pull/142723