tcg: add tcg_reg_sync() Add a new function tcg_reg_sync() to synchronize the canonical location of a temp with the value in the associated register, but without freeing it. Rewrite tcg_reg_free() to first call tcg_reg_sync() and then to free the register. Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>