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The previous patterns directly inserted FMOV or INS instructions into the DAG for scalar_to_vector & bitconvert patterns. This is horribly inefficient and can generated lots more GPR <-> FPR register traffic than necessary. It's much better to emit instructions the register allocator understands so it can coalesce the copies when appropriate. It led to at least one ISelLowering hack to avoid the problems, which was incorrect for v1i64 (FPR64 has no dsub). It can now be removed entirely. This should also fix PR19331. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205616 91177308-0d34-0410-b5e6-96231b3b80d8
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