DebugInfo: Remove dead DIDescriptor::replaceAllUsesWith()

r234696 replaced the only use of `DIDescriptor::replaceAllUsesWith()`
with `DIBuilder::replaceTemporary()` (added in r234695).  Delete the
dead code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234697 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed