radv: use emit_icmp for samples_identical
radv: use emit_icmp for samples_identical

On a debug llvm build we'd assert on the next compare
when the return from samples_identical was i1 instead
of i32.

Cc: "13.0" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>
Signed-off-by: Dave Airlie <f2295d84e358395675bc8031be58672073ae065e@redhat.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler