i965/fs: bail on move-to-flag in sel peephole
i965/fs: bail on move-to-flag in sel peephole

Fixes a piglit regression
(shaders/glsl-fs-vec4-indexing-temp-dst-in-nested-loop-combined) with
my series for GVN.

Reviewed-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>
Signed-off-by: Connor Abbott <71178acffcc112b21e5858656e5751f5e4aa9364@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler