[LLVMdev] JIT on armhf

[Amara Emerson]

Hi David,

For ARM, you will need to use the MCJIT ExecutionEngine as the legacy
one is broken for ARM. (call EngineBuilder::setUseMCJIT()).

When creating your TargetOptions, setting FloatABIType to
FloatABI::Hard should trigger codegen for the correct ABI.

Amara