Finally eliminate printMCInst and send instructions through

Finally eliminate printMCInst and send instructions through
the streamer.  Demo:

$ cat t.ll
define i32 @test() nounwind {
  ret i32 42
}
$ llc t.ll -o -
...
_test:
	movl	$42, %eax
	ret
$ llc t.ll -o t.o -filetype=obj
$ otool -tv t.o
t.o:
(__TEXT,__text) section
_test:
00000000	movl	$0x0000002a,%eax
00000005	ret

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95179 91177308-0d34-0410-b5e6-96231b3b80d8