[PowerPC] Code cleanup. Remove instructions that were withdrawn from Power 9.
The following set of instructions was originally planned to be added for Power 9
and so code was added to support them. However, a decision was made later on to
withdraw support for these instructions in the hardware.
xscmpnedp
xvcmpnesp
xvcmpnedp
This patch removes support for the instructions that were not added.
Differential Revision: https://reviews.llvm.org/D43641
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@325918
91177308-0d34-0410-b5e6-
96231b3b80d8
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