[llvm] [refactor] LLVMProgramImpl code clean up: part-3 #5188
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Related issue = #4800, #5114
Let's avoid accessing LlvmProgramImpl with "dynamic_cast + macro" in high-level object such as
program.cpp
orkernel.cpp
, which strongly burdens the macro management.For the place where ProgramImpl gets dispatched to each backend-specific XXXProgramImpl, it will stay unchanged for now. Will file another issue to discuss how we can replace that with "template + linking"