[CMake] llvm-lto2 depends on intrinsics_gen

[CMake] llvm-lto2 depends on intrinsics_gen

llvm-lto2.cpp has the following include chain:

llvm/LTO/Caching.h
llvm/LTO/LTO.h
llvm/CodeGen/Analysis.h
llvm/IR/CallSite.h
llvm/IR/Attributes.h
llvm/IR/Attributes.gen

This means llvm-lto2 needs to depend on intrinsics_gen.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287434 91177308-0d34-0410-b5e6-96231b3b80d8