[CMake] sanstats depends on intrinsics_gen

sanstats.cpp has the following include chain:

llvm/Transforms/Utils/SanitizerStats.h
llvm/IR/IRBuilder.h
llvm/IR/ConstantFolder.h
llvm/IR/InstrTypes.h
llvm/IR/Attributes.h
llvm/IR/Attributes.gen

This means sanstats needs to depend on intrinsics_gen.

llvm-svn: 287404