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Optimizing heat equation solver

Try to improve the performance of the heat equation solver by optimizing data movements. During the time evolution iteration, the data can be mostly kept within the device.

  1. Implement routines enter_data() and exit_data() (e.g. in cpp/core.cpp or fortran/core.F90). The routines should take current and previous fields as arguments, and create unstructured data region where enter_data() copies the data into the device and exit_data() out from the device. Implement also routine update_host() which takes a single field as argument and copies its data from device to host.

  2. Call the newly created routines at appropriate places in the main routine. Modify also the offload constructs in evolve accordingly.