[llvm-commits] [patch] Use mmap to map archive members

[Rafael Avila de Espindola]

The attached patch changes lto_module_create_from_fd to also take a 
map_size and an offset. With this change the gold plugin can then mmap 
archive members.

Hopefully this change is OK since lto_module_create_from_fd is a new 
function, but there is the question of what to do with 2.9. I think the 
options are

*) Change the signature in 2.9 too but require that offset == 0 and 
map_size == file_size.

*) Don't change lto_module_create_from_fd and instead add a 
lto_module_create_from_fd_at_offset

*) Accept that 3.0 will have a backward incompatible API for 
lto_module_create_from_fd.

Cheers,
Rafael
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