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Filling no-ops is done just before emitting of assembly, when the instruction stream is final. No-ops are inserted to align the instructions so the dual-issue of the pipeline is utilized. This speeds up generated code with a minimum of 1% on a select set of algorithms. This pass may be redundant if the instruction scheduler and all subsequent passes that modify the instruction stream (prolog+epilog inserter, register scavenger, are there others?) are made aware of the instruction alignments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123226 91177308-0d34-0410-b5e6-96231b3b80d8
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