[ThinLTO] Remove unnecessary include of Linker.h (NFC)

The ModuleLinker is no longer used by ThinLTO, so this is not needed.

Patch by Benoit Belley <Benoit.Belley@autodesk.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306028 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed