[CMake] llc depends on intrinsics_gen

llc.cpp has the following include chain:

llvm/Analysis/TargetLibraryInfo.h
llvm/IR/Function.h
llvm/IR/Argument.h
llvm/IR/Attributes.h
llvm/IR/Attributes.gen

This means llc needs to depend on intrinsics_gen.

llvm-svn: 287422