Matthias Braun c8440dddb2 MachineInstrBundle: Pass iterators to getBundle(Start|End); NFC ...

This is a function to go backwards in a block to find the first
instruction in a bundle, so iterator is a more natural choice for
parameter/return rather than a reference to a MachineInstruction.

llvm-svn: 285051

2016-10-25 02:55:17 +00:00

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