Add max_interleaving DPC++ FPGA tutorial

[citian-intel]

Add max_interleaving DPC++FPGA tutorial

Description

This tutorial demonstrates how to apply the max_interleaving attribute to loops and how it affects loop resource use.

Fixes # (issue)

Type of change

Please delete options that are not relevant. Add a 'X' to the one that is applicable.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Command Line

[citian-intel]

@akertesz @AlbyB @pmpeter1 @tomlenth please review.

[tomlenth]

This looks good to me. thank you.

[akertesz]

Your code is written for DPC++ compiler beta10 version. However, we require backwards compatibility with the beta09 compiler until the beta10 version is formally released.

Please add the following code for backwards compatability:

// Header locations and some DPC++ extensions changed between beta09 and beta10
// Temporarily modify the code sample to accept either version
#define BETA09 20200827
#if __SYCL_COMPILER_VERSION <= BETA09
  #include <CL/sycl/intel/fpga_extensions.hpp>
  namespace INTEL = sycl::intel;  // Namespace alias for backward compatibility
#else
  #include <CL/sycl/INTEL/fpga_extensions.hpp>
#endif

You can refer to #167 to see an example of this.

[pmpeter1]

Missing header file location comment above "dpc_common.hpp"

[pmpeter1]

You should not be including <CL/sycl.hpp> twice.

[akertesz]

Windows CI failed -- looks like a basic copy-paste error. Please update your ninja file to reference the correct files!

[akertesz]

Approved to re-launch the CI test

[citian-intel]

I have tested the windows flow locally, adding an explicit scope to the sqrt function fix the failures on windows.

[akertesz]

Let's retrigger the CI test to see whether the sqrt issue is resolved.

[akertesz]

Paul's comment is addressed, Tom is satisfied with the README, and CI is passing -- I think we're good to go!