[llvm-objdump] for mach-o add -bind, -lazy-bind, and -weak-bind options

This finishes the ability of llvm-objdump to print out all information from
the LC_DYLD_INFO load command.

The -bind option prints out symbolic references that dyld must resolve 
immediately.

The -lazy-bind option prints out symbolc reference that are lazily resolved on 
first use.

The -weak-bind option prints out information about symbols which dyld must
try to coalesce across images.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217853 91177308-0d34-0410-b5e6-96231b3b80d8
[x86] Cleanup an unused variable by actually using it in the non-asserts
place where it was needed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217854 91177308-0d34-0410-b5e6-96231b3b80d8
[x86] Remove a FIXME that doesn't make any sense. Only the lanes feeding
the blend that is matched by this are "used" in any sense, and so any
build_vector or other nodes feeding these will already drop other lanes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217855 91177308-0d34-0410-b5e6-96231b3b80d8