[ORC] Port CallableTraitsHelper from the new ORC runtime. (#170441) The code for this commit was taken with minimal modification to fit LLVM style from llvm-project/orc-rt/include/CallableTraitsHelper.h and llvm-project/orc-rt/unittests/CallableTraitsHelperTest.cpp (originally commited in 40fce325011) CallableTraitsHelper identifies the return type and argument types of a callable type and passes those to an implementation class template to operate on. E.g. the CallableArgInfoImpl class exposes these types as typedefs. Porting CallableTraitsHelper from the new ORC runtime will allow us to simplify existing and upcoming "callable-traits" classes in ORC.
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