Stop leaking register infos in the disassemblers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187695 91177308-0d34-0410-b5e6-96231b3b80d8
ARMAsmParser: Plug a leak.

Using an object to do the cleanup may look like overkill, but it's safer and nicer than putting deletes everywhere.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187696 91177308-0d34-0410-b5e6-96231b3b80d8
llvm-rtdyld: Don't leak memory managers.

Dyld never outlives MemMgr, just put both on the stack.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187697 91177308-0d34-0410-b5e6-96231b3b80d8
MachObjectFile: Don't leak on error.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187698 91177308-0d34-0410-b5e6-96231b3b80d8