[PATCH] Get the LLVM_ENABLE_MODULES build going for LLVM

[Duncan P. N. Exon Smith]

These changes collectively get LLVM building with
-DLLVM_ENABLE_MODULES=ON using Xcode 7 beta as the host compiler.

I imagine this patch would help out the very red
http://lab.llvm.org:8011/builders/clang-x86_64-linux-selfhost-modules
a little, although I only went as far as LLVM locally.

I'll split this up before commit, but I wouldn't mind a quick check that
I'm fixing things "correctly".  In particular, most libraries now depend
on `intrinsics_gen` to ensure that llvm/IR/Intrinsics.gen gets built
before anyone includes the LLVM_IR module (I found the complete list by
inserting a compile error in TableGen.cpp and running `ninja -k 2` until
that was the only error).  Is there a better way to represent this
dependency?

Also, is there any reason LLVM_ENABLE_MODULES isn't documented at
http://llvm.org/docs/CMake.html
?

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