Remove llvm-ld and llvm-stub (which is only used by llvm-ld).

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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155147 91177308-0d34-0410-b5e6-96231b3b80d8

docs/ReleaseNotes.html

@@ -604,6 +604,7 @@ syntax, there are still significant gaps in that support.</p>
 <ul>
   <li>llvm-stress is a command line tool for generating random .ll files to fuzz
       different LLVM components. </li>
+  <li>llvm-ld has been removed.  Use llvm-link or Clang instead.</li>
   <li>....</li>
 </ul>