[code-reflection] RFR: Support for Generalized Buffer Type in Hat SPIR-V Backend

[hanklo6]

This PR introduces support for generalized buffer by creating SPIRV type structure and arrays in the generated module. Most of the implementation references the OpenCL Hat builder. The SPIR-V module assumes the same memory layout as the java buffer object, provided there is not additional customized padding between fields. Also, generated dependent functions from callgraph instead of using code model to resolve the issue where private functions can't be accessed.

The blackscholes, mandel, and violajones examples now run successfully. However, the violajones example still gets wrong value when accessing `threshold` from `stage` inside `isAFaceStage` function, so I currently update the condition to `sumOfThisStage > threshold`.

For machines that don't have `float64` capability, enable `FP64` emulation by setting the environment variable: `OverrideDefaultFP64Settings=1` and `IGC_EnableDPEmulation=1` before running. For more details: https://github.com/intel/compute-runtime/blob/master/opencl/doc/FAQ.md#feature-double-precision-emulation-fp64

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Commit messages:
 - Remove whitespace
 - Support iface buffer
 - Print log during building module

Changes: https://git.openjdk.org/babylon/pull/298/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=298&range=00
  Stats: 518 lines in 5 files changed: 462 ins; 16 del; 40 mod
  Patch: https://git.openjdk.org/babylon/pull/298.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/298/head:pull/298

PR: https://git.openjdk.org/babylon/pull/298