i965/blorp: Add MSAA encode/decode support to the NIR path
i965/blorp: Add MSAA encode/decode support to the NIR path

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

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler