code following eval {} not always optimised

In something like this

    eval { 1 while 1 };
    $x = $a[0];

The optimising of the while loop makes Perl_rpeep() miss processing the
chain of ops from the OP_LEAVETRY onwards. So in the code above for
example, the alem wont be optimised into an alemfast.

Fix this by explicitly recursing into the entertry->op_other branch
(which actually points at the leavetry).

The infinite loop above can be broken by, for example, a signal handler
calling die.

Author: iabyn

op.c

@@ -11884,6 +11884,11 @@ Perl_rpeep(pTHX_ OP *o)
 	    DEFER(cLOOP->op_lastop);
 	    break;
 
+        case OP_ENTERTRY:
+	    assert(cLOGOPo->op_other->op_type == OP_LEAVETRY);
+	    DEFER(cLOGOPo->op_other);
+	    break;
+
 	case OP_SUBST:
 	    assert(!(cPMOP->op_pmflags & PMf_ONCE));
 	    while (cPMOP->op_pmstashstartu.op_pmreplstart &&