[RUNTIME][OPENCL] Create program lazily when the program is built #1408
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tqchen
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sergei-mironov
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This PR adds multiple devices support for OpenCL FPGA runtime.
When creating programs for FPGAs, we have to specify which device is used to load the OpenCL binary. However, we don't know the target device at the initialization stage. This PR delays creating the program until the execution stage.