Reschedule after many cases of eating cycles.

All of these eat enough cycles they could cause issues in a loop, and I'm
pretty sure they would reschedule.
Merge pull request #6305 from unknownbrackets/resched

Reschedule after many cases of eating cycles
Merge pull request #6308 from unknownbrackets/gpu-minor

Support gpu memcpy/memset line-by line
Update native
Minor cleanup in texcache
The "fallback" title is already set, don't need to set it again
Attempt fix for cpuid on x86

Sign extension would be bad.

(couldn't test it right now, adb driver issues :/)
Buildfix for Linux/Android x86.
Implement in-shader blending on gles2 / gl2.

I'm sure it'll be slow, though...