This reverts commit r211533 and r211539.

 Revert "Fix PR20056: Implement pseudo LDR <reg>, =<literal/label> for AArch64"
 Revert "Fix cmake build."

It was missing a file.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211540 91177308-0d34-0410-b5e6-96231b3b80d8