Make CL_CONFORMANCE_RESULTS_FILENAME Bazel-aware (#2629)

Bazel requires that test outputs are put in a specific directory given
by $TEST_UNDECLARED_OUTPUTS_DIR when running a test through Bazel test

This patch checks for the environment variable $BAZEL_TEST, which Bazel
sets when running tests, and prepends the specified directory to the
user-provided path.

The behaviour when running outside of a bazel test environment is
unchanged

Tagged by Qualcomm

tests for cl_khr_spirv_queries (#2409)

See: KhronosGroup/OpenCL-Docs#1385

Add cl_khr_unified_svm to the list of known extensions in the compile…

…r defines for extension test. (#2433)

Adds cl_khr_unified_svm to the list of known extensions in the compiler
defines for extension test.

Qualcomm tagged

Define SubDevicesScopeGuarded in the harness and remove duplicate cop…

…ies (#2379)

Signed-off-by: Kévin Petit <kpet@free.fr>

Require C++17 (#2356)

This enables many useful newer C++ features. C++17 is already required
by many components of the Khronos ecosystem.

Signed-off-by: Kevin Petit <kevin.petit@arm.com>

bruteforce: Update ULP for half-precision divide to 1.0f (#2214)

CTS test update to match proposed spec update
KhronosGroup/OpenCL-Docs#1278