[AMDGPU] Assertion "This is not a register operand!" failed in SIFixSGPRCopies

[jayfoad]

With this test case I get:

$ ~/llvm-release/bin/llc -mtriple=amdgcn -mcpu=gfx1100 r1.txt
llc: include/llvm/CodeGen/MachineOperand.h:366: Register llvm::MachineOperand::getReg() const: Assertion `isReg() && "This is not a register operand!"' failed.

llc built from git revision 78281fd.

[llvmbot]

@llvm/issue-subscribers-backend-amdgpu

Author: Jay Foad (jayfoad)

With this [test case](https://github.com/user-attachments/files/19111170/r1.txt) I get: ``` $ ~/llvm-release/bin/llc -mtriple=amdgcn -mcpu=gfx1100 r1.txt llc: include/llvm/CodeGen/MachineOperand.h:366: Register llvm::MachineOperand::getReg() const: Assertion `isReg() && "This is not a register operand!"' failed. ``` `llc` built from git revision 78281fd.

[arsenm]

This appears to be re-processing an already deleted instruction

[arsenm]

Likely duplicate #130646