test(cpu): PPCBUG-091/100/109-111/118/127/129/132/146-147/153/163/171 P8 batch 2 — load/store
Phase 8 batch 2 — load/store test gap closure.
15 new tests across the load/store opcodes:
- lbz zero-extend (091), lwbrx byte-swap (109/110), lwarx smoke (111),
ld doubleword (118), lmw + lswi (127), lswx with XER TBC (127),
lfs single-to-double widening (129).
- stb (132), sth, stw (146), std (153), stmw + stswx (163), stfs (171).
`lswx_uses_xer_tbc_for_byte_count` and `stswx_uses_xer_tbc_for_byte_count`
specifically lock in the new XER TBC infrastructure landed in P6 (68c0ee5);
both opcodes were permanent no-ops before that.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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