i965/blorp: Refactor getting the blit kernel into a helper
i965/blorp: Refactor getting the blit kernel into a helper

Reviewed-by: Topi Pohjolainen <749697f19798b7f640b17221fd283b903825f071@intel.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler