accel/tcg: Move cpu_loop_exit_*() out of 'exec/cpu-common.h'

Move the following TCG-specific cpu_loop_exit_*() declarations
out of the generic "exec/cpu-common.h" header, to the recently
created "accel/tcg/cpu-loop.h" one, documenting them:

 - cpu_loop_exit_noexc()
 - cpu_loop_exit_atomic()
 - cpu_loop_exit_restore()
 - cpu_loop_exit()

Include "accel/tcg/cpu-loop.h" where appropriate.

Signed-off-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20260617171438.75914-11-philmd@oss.qualcomm.com>

plugins/api.c

@@ -40,6 +40,7 @@
 #include "qemu/plugin.h"
 #include "qemu/log.h"
 #include "system/memory.h"
+#include "accel/tcg/cpu-loop.h"
 #include "tcg/tcg.h"
 #include "exec/cpu-common.h"
 #include "exec/gdbstub.h"