[PATCH][llvm-c] Expose MC JIT

[Filip Pizlo]

Included are two patches that expose MCJIT via the C API:

The first patch makes the MCJIT use the default JITMemoryManager if no memory manager is provided.  This simplifies integration with the C API, which does not already expose a mechanism for supplying a custom memory manager.

The second patch exposes the MCJIT via the C API, and also exposes the NoFramePointerElim option.  The manner in which options are exposed is designed for forward compatibility; you supply an options struct along with a size which you zero-fill prior to manipulating.  This is similar to the idiom I've seen used in other C APIs like BerkeleyDB.  I considered having separate C function calls for each option, in the style of the ExecutionEngineBuilder API - but while that idiom feels right to me in C++, it feels less C-like.  As well, the current options approach exposes not just parts of the Builder but also part of TargetOptions (namely, NoFramePointerElim).  It's also more concise in practice.

I plan to expose more innards through the LLVMMCJITCompilerOptions in the future.  I'd be happy to do more of that in one go if that was preferred; but I thought that a baby step would be the best thing for now.

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-Filip