[Archive] Update to LLVM change.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@174273 91177308-0d34-0410-b5e6-96231b3b80d8
[ELF] Fix uninitialized variable.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@174274 91177308-0d34-0410-b5e6-96231b3b80d8
[ELF][Reader] Improve performance by removing calls to malloc.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@174275 91177308-0d34-0410-b5e6-96231b3b80d8
[ELF] Use LLVM_IS_UNALIGNED_ACCESS_FAST.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@174276 91177308-0d34-0410-b5e6-96231b3b80d8
[Resolver] Improve undefined symbol error.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@174277 91177308-0d34-0410-b5e6-96231b3b80d8