swr: [rasterizer core] Reduce Arena blocksize to 128KB (from 1MB).
swr: [rasterizer core] Reduce Arena blocksize to 128KB (from 1MB).

With global allocator this doesn't seem to affect performance at all.
Overall memory consumption drops by up to 85%.

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler