this is required for cl_khr_command_buffer

CL/opencl.h: include cl_ext_pocl.h but exclude cl_gl_ext.h
(now just redirects to cl_ext.h)

This class is used to implement Graphs that execute "natively"
in the backend, using OpenCL command-buffers or LevelZero command-lists
and only synchronizing with the host when required. Fallback to
original Graph is provided in chipstar::GraphExec::launch()

Add more error-checking to the hipGraphXYZ APIs & bugfixes

Additionally, samples/graph + samples/graphMatrixMultiply
work using the "native graphs" (cl_command_buffer), not
the original chip-spv's graph execution.

Merged style fixes by Henry.

Co-authored-by: Henry Linjamäki <linehill@users.noreply.github.com>

move graph tests to FAILING_FOR_ALL

the constructors were copying the value of Args pointer,
instead of making an actual copy of the arguments. This
can lead to a crash if the Args pointer lives on the stack,
later goes out of scope, and setupAllArgs() is called.