- Checkpointing new support for concurrent kernel execution (CUDA only, not OpenCL)

  This changelist adds full support for streams supported by a new class,
  stream_manager and enables concurrent execution of kernels from different
  streams.

- fast_regression.sh fails for simpleMultiCopy, simpleStreams (other tests
  passing)

** Known issues **
- Kernel parameter passing is not done correctly for concurrent kernel execution
  (somehow concurrentKernels is not affected by this): the parameters are
  stored inside function_info, which is shared among parallel kernel launches
  so that the values passed into the launch are likely to get overwritten if
  multiple grids are launched in parallel streams.

- Statistics are printed out whenever the simulation thread runs out of
  cuda commands (doesn't make sense to print out when a kernel ends during
  concurrent kernel execution).  This will probably require further tweaking
  so as to be more compatible with data collection scripts.

[git-p4: depot-paths = "//depot/gpgpu_sim_research/fermi/distribution/": change = 8302]

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