[CMake] llvm-dwp depends on intrinsics_gen

llvm-dwp.cpp has the following include chain:

llvm/CodeGen/AsmPrinter.h
llvm/CodeGen/MachineFunctionPass.h
llvm/CodeGen/MachineFunction.h
llvm/CodeGen/MachineBasicBlock.h
llvm/CodeGen/MachineInstr.h
llvm/Analysis/AliasAnalysis.h
llvm/IR/CallSite.h
llvm/IR/Attributes.h
llvm/IR/Attributes.gen

This means llvm-dwp needs to depend on intrinsics_gen.

llvm-svn: 287429