New GlobalMappingLayer for Orc

[Andy Somogyi via llvm-commits]

Attached is a patch that contains the new GlobalMappingLayer for Orc. 

This layer allows existing global values to be added and resolved in the Orc JIT just like it was possible with ExecutionEngine. The Orc kaleidoscope example was updated to use the new GlobalMappingLayer, and actually use the three defined external functions. 

The new layer contains all the functionality that ExecutionEngine had, and with this layer, it should be very straightforward to finish the OrcMCJITReplacement to reference existing C functions and data. 


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