llvm dev - Mar 2017 - C API equivalent of EngineBuilder::setMArch?

I'm using MCJIT, and I'm trying to coax it into generating code for the
native architecture, e.g. use AVX2 instructions on x86-64.
It looks like this is possible using EngineBuilder::setMArch().
However, I'm using the C interface, and I don't see an obvious
equivalent.
Is it possible to do this?

Toshi
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