[llvm-c] Make LLVMGetTargetFromName actually work

LLVMGetTargetFromName used to compare two char* strings directly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194771 91177308-0d34-0410-b5e6-96231b3b80d8
[OCaml] Fix building of stub libraries

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194772 91177308-0d34-0410-b5e6-96231b3b80d8
[OCaml] Refactor Llvm_target interface

This commit brings the module structure, argument order and
primitive names in Llvm_target in order with the rest of the bindings,
in preparation for adding TargetMachine API.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194773 91177308-0d34-0410-b5e6-96231b3b80d8
[OCaml] Add Target and TargetMachine bindings to Llvm_target

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194774 91177308-0d34-0410-b5e6-96231b3b80d8