[AMDGPU] Fix insertSimulatedTrap to return correct continuation block (#174774) `insertSimulatedTrap` was returning `HaltLoopBB` when the trap was in a block with no successors and was the last instruction. Since `HaltLoopBB` gets appended to the end of the function, `FinalizeISel` would jump there and skip any intermediate blocks, leaving their pseudos unexpanded. Fix by returning `MBB.getNextNode()` unconditionally: - After `splitAt()`: `getNextNode()` returns the split-off block (`ContBB`) - No split, `MBB` in middle: `getNextNode()` returns the next original block - No split, `MBB` was last: `getNextNode()` returns `HaltLoopBB` (just pushed) Since we always `push_back(HaltLoopBB)` before returning, `getNextNode()` can never be `nullptr`: if `MBB` was the last block, `HaltLoopBB` is now after it. Fixes: SWDEV-572407
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