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7ca2a7d742
Adds code generation support for dcbtst (data cache prefetch for write) and icbt (instruction cache prefetch for read - Book E cores only). We still end up with a 'cannot select' error for the non-supported prefetch intrinsic forms. This will be fixed in a later commit. Fixes PR20692. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216339 91177308-0d34-0410-b5e6-96231b3b80d8