remove fragile_ops flag, it just suppresses valuable information and even was disabled by default

[r27988]

include/libfirm/irflag.h

@@ -149,15 +149,6 @@ FIRM_API void set_opt_optimize_class_casts(int value);
 FIRM_API void set_opt_suppress_downcast_optimization(int value);
 FIRM_API int get_opt_suppress_downcast_optimization(void);
 
-/** Enable/Disable floating of fragile ops.
- *
- * This flags enables/disables the floating of fragile operations.
- * If this flag is on, fragile operations which are known to NOT raise
- * an exception can be place to other basic blocks.
- * Otherwise they remain in the block they were created.
- */
-FIRM_API void set_opt_fragile_ops(int value);
-
 /**
  * Enable/Disable Confirm node removal during local optimization.
  */

ir/ir/irflag_t.def

@@ -77,9 +77,6 @@ I_FLAG(allow_conv_b                       , 13, ON)
 /** precise exception context */
 I_FLAG(precise_exc_context                , 15, OFF)
 
-/** Optimize Fragile OPs */
-I_FLAG(fragile_ops                        , 16, OFF)
-
 /** Optimize cast nodes. */
 E_FLAG(suppress_downcast_optimization     , 22, OFF)
 

ir/ir/irnode_t.h

@@ -328,7 +328,8 @@ static inline op_pin_state _get_irn_pinned(const ir_node *node)
 	state = _get_op_pinned(_get_irn_op(node));
 
 	if (state >= op_pin_state_exc_pinned)
-		return get_opt_fragile_ops() ? node->attr.except.pin_state : op_pin_state_pinned;
+		return node->attr.except.pin_state;
+
 	return state;
 }