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As a narrow stopgap for the assertion failure described in PR45025, add a describeLoadedValue override to ARMBaseInstrInfo and use it to detect copies in which the forwarding reg is a super/sub reg of the copy destination. For the moment this is unsupported. Several follow ups are possible: 1) Handle VORRq. At the moment, we do not, because isCopyInstrImpl returns early when !MI.isMoveReg(). 2) In the case where forwarding reg is a super-reg of the copy destination, we should be able to describe the forwarding reg as a subreg within the copy destination. I'm not 100% sure about this, but it looks like that's what's done in AArch64InstrInfo. 3) In the case where the forwarding reg is a sub-reg of the copy destination, maybe we could describe the forwarding reg using the copy destinaion and a DW_OP_LLVM_fragment (I guess this should be possible after D75036). https://bugs.llvm.org/show_bug.cgi?id=45025 rdar://59772698 Differential Revision: https://reviews.llvm.org/D75273
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