PPC32: avoid stale TBs across snapshot's mprotect swaps#3832
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Description
PPC32 TCG retains translation blocks past the mprotect()-driven page swaps performed above, so the next dispatch from the snapshotted PC executes stale TBs and SIGILLs even though guest memory and registers have been restored byte-identically. An explicit JIT flush after permission + content restoration fixes it. Gated on ppc to avoid the throughput hit on other targets (unless someone confirms a global flush is harmless).
Checklist
./scripts/precommit.shand addressed all comments