[ThinLTO] Remove unnecessary include of Linker.h (NFC)
[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: 0ff597fd157e6f4fc38580e8d64ab130330d2411@306028 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,apple/swift-llvm,llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm,llvm-mirror/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm