freedreno/a6xx: fix LRZ hang

In detecting the case where we actually do need to re-emit LRZ state
(due to new batch), we were checking `ctx->last.dirty` to detect when
we cannot trust previous state.  But this is cleared before we check
it.

Move where it is cleared to the end of the draw_vbo() path.

Fixes: dfa702e94b ("freedreno/a6xx: limit LRZ state emit")
Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4842>

src/gallium/drivers/freedreno/a6xx/fd6_draw.c

@@ -137,8 +137,6 @@ fixup_draw_state(struct fd_context *ctx, struct fd6_emit *emit)
 		ctx->dirty |= FD_DIRTY_RASTERIZER;
 		ctx->last.primitive_restart = emit->primitive_restart;
 	}
-
-	ctx->last.dirty = false;
 }
 
 static bool

src/gallium/drivers/freedreno/freedreno_context.h

@@ -450,6 +450,7 @@ fd_context_all_dirty(struct fd_context *ctx)
 static inline void
 fd_context_all_clean(struct fd_context *ctx)
 {
+	ctx->last.dirty = false;
 	ctx->dirty = 0;
 	for (unsigned i = 0; i < PIPE_SHADER_TYPES; i++) {
 		/* don't mark compute state as clean, since it is not emitted