Re-add support to llvm-objdump for Mach-O universal files and archives with -macho
with fixes.  Includes the move of tests for llvm-objdump for universal files to an X86
directory.  And the fix where it was failing on linux Rafael tracked down with asan.
I had both Jim Grosbach and Adam Hemet look over the second fix since I could not
set up asan to reproduce with the old version but not with the fix.

llvm-svn: 223416
diff --git a/llvm/test/CodeGen/Thumb/iabs.ll b/llvm/test/CodeGen/Thumb/iabs.ll
index 76224bc..ecd4a6b 100644
--- a/llvm/test/CodeGen/Thumb/iabs.ll
+++ b/llvm/test/CodeGen/Thumb/iabs.ll
@@ -1,5 +1,5 @@
 ; RUN: llc < %s -mtriple=thumb-unknown-unknown -filetype=obj -o %t.o
-; RUN: llvm-objdump -disassemble -arch=thumb %t.o | FileCheck %s
+; RUN: llvm-objdump -disassemble -arch-name=thumb %t.o | FileCheck %s
 
 define i32 @test(i32 %a) {
         %tmp1neg = sub i32 0, %a