[AMDGPU][NPM] Fix CFG invalidation detection in insertSimulatedTrap (#169290) When SIMULATED_TRAP is at the end of a block with no successors, insertSimulatedTrap incorrectly returns the original MBB despite adding HaltLoopBB to the CFG. EmitInstrWithCustomInserter detects CFG changes by comparing the returned MBB with the original. When they match, it assumes no modification occurred and skips MachineLoopInfo invalidation. This causes stale loop information in subsequent passes, particularly when using the NPM which relies on accurate invalidation signals. Fix: Return HaltLoopBB to properly signal the CFG modification.
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