[tree-ssa] Loop header copying on trees

[law@redhat.com]

In message <20040219205138.GA29716@atrey.karlin.mff.cuni.cz>, Zdenek Dvorak wri
tes:
 >Hello,
 >
 >> In cfglayout.c you added the following line:
 >> 
 >>  >+ extern bool cfg_layout_can_duplicate_bb_p (basic_block);
 >> 
 >> Shouldn't we be getting that from a header file somewhere?  We generally
 >> frown upon exteral declarations in .c files.  Similarly for
 >> 
 >>  > + extern basic_block cfg_layout_duplicate_bb (basic_block);
 >
 >this is intentional.  I do not want to put the declaration into a header
 >so that it cannot be used directly (it should be only used through
 >cfghooks); the other possibility how to achieve this would be to move
 >the code to cfgrtl and make it static, but it seems cleaner to keep
 >it in a separate file.
OK.  Can you put a comment to that effect both at the function declaration
and the function's definition?

Thanks,
jeff