accel/tcg: Record DisasContextBase in tcg_ctx for plugins

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

accel/tcg/plugin-gen.c

@@ -329,6 +329,7 @@ bool plugin_gen_tb_start(CPUState *cpu, const DisasContextBase *db,
         tcg_gen_plugin_cb(PLUGIN_GEN_FROM_TB);
     }
 
+    tcg_ctx->plugin_db = db;
     tcg_ctx->plugin_insn = NULL;
 
     return ret;

include/tcg/tcg.h

@@ -537,6 +537,7 @@ struct TCGContext {
      * space for instructions (for variable-instruction-length ISAs).
      */
     struct qemu_plugin_tb *plugin_tb;
+    const struct DisasContextBase *plugin_db;
 
     /* descriptor of the instruction being translated */
     struct qemu_plugin_insn *plugin_insn;