line insn notes cleanups (haifa-sched and modulo-sched)

[Vladimir N. Makarov]

Daniel Berlin wrote:

>Vladimir Makarov wrote:
>  
>
>>Tehila Meyzels wrote:
>>
>>    
>>
>>>Thanks for the comments.
>>>Following is the fixed svn diff output.
>>>
>>>I'm going to build and test it also on x86 (i686-pc-linux-gnu), when I'll
>>>be able to.
>>>Currently, I built and checked it only on ppc (powerpc-suse-linux).
>>>
>>>
>>> 
>>>
>>>      
>>>
>>Sorry, I don't understant why do you need this patch.
>>
>>You will not have additional failures on gcc regression tests.  But you 
>>will see a big difference in gdb.  Line notes are important for 
>>debugging.  They should be bound to the corresponding insns. 
>>    
>>
>
>You could also get away with just attaching the info directly to the
>insn, instead of notes.  Then you wouldn't have to deal with moving them
>around at all :)
>  
>
Riding off the line notes is a good idea and I really like it but they 
have not removed yet.  As I wrote Tehila,  scheduler should be the last 
place to remove the code dealing with the line notes because without the 
code the line notes will misinform and confuse people at least when they 
look at  dump files after the insn scheduler work.