[Bug lto/59000] lto can't merge user-defined weak builtin functions

[ma.jiang at zte dot com.cn]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59000

--- Comment #1 from ma.jiang at zte dot com.cn ---
Created attachment 31157
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31157&action=edit
second source