video_core: flush GPU-written code when capturing native shaders

10e7063905 moved native program capture from one ReadBlock per instruction to
ReadBlockUnsafe per 4 KiB page. ReadBlockUnsafe skips the rasterizer flush, so
code that a GPU copy had written and not yet flushed to guest memory was
captured stale. The speed-up comes from reading a page at a time, not from
skipping the flush: read each page (and the odd single instruction outside a
fully mapped page) with ReadBlock, which flushes once per page instead of once
per instruction.

Follow-up to 10e7063905.

Assisted-by: Claude Sonnet 5.5 (implementation and commit message)

0 files changed, 0 insertions, 0 deletions