[all-commits] [llvm/llvm-project] b454b0: [AArch64] Fix a compiler crash in MachineSink (#67...

[Momchil Velikov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b454b04d686991626f2de7ad639456bfc96c510a
      https://github.com/llvm/llvm-project/commit/b454b04d686991626f2de7ad639456bfc96c510a
  Author: Momchil Velikov <momchil.velikov at arm.com>
  Date:   2023-09-29 (Fri, 29 Sep 2023)

  Changed paths:
    M llvm/lib/CodeGen/MachineSink.cpp
    A llvm/test/CodeGen/AArch64/sink-and-fold-dbg-value-crash.mir

  Log Message:
  -----------
  [AArch64] Fix a compiler crash in MachineSink (#67705)

There were a couple of issues with maintaining register def/uses held
in `MachineRegisterInfo`:

* when an operand is changed from one register to another, the
corresponding instruction must already be inserted into the function,
or MRI won't be updated

* when traversing the set of all uses of a register, that set must not
change