Revert "Introduce llvm-install-name-tool"

This temporarily reverts the commit 88f00aef684ff84a6494e1f17d5466c5678f703d.
The change broke the buildbot http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fast/builds/36836
diff --git a/llvm/tools/llvm-objcopy/MachO/MachOWriter.cpp b/llvm/tools/llvm-objcopy/MachO/MachOWriter.cpp
index 0d95906..59d57f7 100644
--- a/llvm/tools/llvm-objcopy/MachO/MachOWriter.cpp
+++ b/llvm/tools/llvm-objcopy/MachO/MachOWriter.cpp
@@ -180,8 +180,7 @@
       MachO::swapStruct(MLC.LCStruct##_data);                                  \
     memcpy(Begin, &MLC.LCStruct##_data, sizeof(MachO::LCStruct));              \
     Begin += sizeof(MachO::LCStruct);                                          \
-    if (!LC.Payload.empty())                                                   \
-      memcpy(Begin, LC.Payload.data(), LC.Payload.size());                     \
+    memcpy(Begin, LC.Payload.data(), LC.Payload.size());                       \
     Begin += LC.Payload.size();                                                \
     break;
 
@@ -194,8 +193,7 @@
         MachO::swapStruct(MLC.load_command_data);
       memcpy(Begin, &MLC.load_command_data, sizeof(MachO::load_command));
       Begin += sizeof(MachO::load_command);
-      if (!LC.Payload.empty())
-        memcpy(Begin, LC.Payload.data(), LC.Payload.size());
+      memcpy(Begin, LC.Payload.data(), LC.Payload.size());
       Begin += LC.Payload.size();
       break;
 #include "llvm/BinaryFormat/MachO.def"