This gets rid of almost LLVM targets unconditionally depending on intrinsic_gen.

Clang's modules still have weird dependencies and hard to remove intrinsics_gen in better way.
Then, it'd be better to give whole clang targets depend on intrinsic_gen.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@308844 91177308-0d34-0410-b5e6-96231b3b80d8