[LLVM-C] [OCaml] Expose Type::subtypes.

The C functions added are LLVMGetNumContainedTypes and
LLVMGetSubtypes.

The OCaml function added is Llvm.subtypes.

Patch by Ekaterina Vaartis.

Differential Revision: https://reviews.llvm.org/D33677

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304709 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed