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vrend: second round of micro-optimizations

Merged Gert Wollny requested to merge gerddie/virglrenderer:rework-sub into master
  • replace use of ctx->sub by a pre-dereferenced pointer, and also pass this pointer to function calls
  • add more helper variables for pointer derefs to hint the compiler which derefs are re-used
  • remove some obsolete or superfluous checks

In summary this gives another 3% speed boost in the Unigine Heaven benchmark, and also improves the reported FPS for most game traces we used for performance analysis.

Edited by Gert Wollny