nir: Remove function overload in control flow test
nir: Remove function overload in control flow test

Fixes make check.

Signed-off-by: Aaron Watry <af2ebef3721cdd7b625ae5c26be8f78487857230@gmail.com>
Reviewed-by: Jason Ekstrand <b186559eaedf698788888c8a2559b4efb4db10d6@intel.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler