[X86] Add test cases that show cases where buildvector of extract and inserts...
[X86] Add test cases that show cases where buildvector of extract and inserts should be turned into fmsubadd. This is a follow up to the fmaddsub support added in r320950. Hopefully in the future we can fix lowering to handle this fmsubadd too. llvm-svn: 320951
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