i965/fs: Add missing analysis invalidation in opt_sampler_eot().
i965/fs: Add missing analysis invalidation in opt_sampler_eot().

Bug found by the liveness analysis validation pass that will be
introduced in a later commit.  opt_sampler_eot() was allocating
registers and inserting and removing instructions, which makes the
cached liveness analysis calculation inconsistent with the shader IR,
so it must be invalidated.

Cc: 59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org
Reviewed-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler