video_core: compact the macro memo arena; download profiling counters

Calls stored again with another shape leave their old record in the memo's arena;
title 1 filled its 16 MiB every ~2 s and clearing it made the next ~20,000 calls
interpret again. The live records are now copied to a new arena (a clear only when
they alone fill three quarters of it). The memo statistics count hits on the last
call's slot and compactions. With EDEN_NX2_GPU_PROFILE the GPU thread also reports
how much downloaded buffer data lands on pages the native MME has DMA-read.

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