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

[Lei Huang via llvm-commits]

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+// Testfile for negative condition for BCD builtins national2packed, packed2zoned and zoned2packed.
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lei137 wrote:

What is the difference between this and `clang/test/Sema/builtins-bcd-transform.c` below?
I am not sure we need both.

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