Fix erroneous fail info of a hipe bs_primop

[Kostis Sagonas]

In very rare circumstances, the icode_type pass of the HiPE compiler 
could generate erroneous code due to not taking into account that the 
{bs_start_match, ok_matchstate} primop could fail.

   git fetch git://github.com/kostis/otp.git bs_start_match-fails

Kostis