llvm-ld is no longer useful and causes confusion and so it is being removed.

* Does not work very well on Windows because it must call a gcc like driver to
  assemble and link.
* Has lots of hard coded paths which are wrong on many systems.
* Does not understand most of ld's options.
* Can be partially replaced by llvm-link | opt | {llc | as, llc -filetype=obj} |
  ld, or fully replaced by Clang.

I know of no production use of llvm-ld, and hacking use should be
replaced by Clang's driver.

llvm-svn: 155147

is not everything, but the remaining cases are less trivial.

llvm-svn: 115080

the list of link time passes to be run, just as for opt, with the
-debug-pass=Arguments option.

llvm-svn: 41040

the pass arguments that it supports.

llvm-svn: 41019

llvm-svn: 33903

Don't generate the reference output for each comparison.

llvm-svn: 32395

llvm-svn: 32369

llvm-svn: 31901

llvm-svn: 31893

llvm-svn: 31849

llvm-svn: 31786

llvm-svn: 31700

llvm-svn: 31678

llvm-svn: 31582

llvm-svn: 31581

helps when bugpoint can't find the problem directly because it needs the
set of optimizations that cause the program to fail.

llvm-svn: 31580