Added support for cl_ext_float_atomics in CBasicTestFetchAddSpecialFloats with atomic_float (#2371)

Related to #2142, according to the work plan, extending
CBasicTestFetchAddSpecialFloats with support for atomic_float.

test_conformance/c11_atomics/main.cpp

@@ -31,6 +31,8 @@ int gInternalIterations = 10000; // internal test iterations for atomic operatio
 int gMaxDeviceThreads = 1024; // maximum number of threads executed on OCL device
 cl_device_atomic_capabilities gAtomicMemCap,
     gAtomicFenceCap; // atomic memory and fence capabilities for this device
+
+cl_device_fp_config gFloatFPConfig = 0;
 cl_half_rounding_mode gHalfRoundingMode = CL_HALF_RTE;
 bool gFloatAtomicsSupported = false;
 cl_device_fp_atomic_capabilities_ext gHalfAtomicCaps = 0;
@@ -148,6 +150,13 @@ test_status InitCL(cl_device_id device) {
             sizeof(gFloatAtomicCaps), &gFloatAtomicCaps, nullptr);
         test_error_ret(error, "clGetDeviceInfo failed!", TEST_FAIL);
 
+        error = clGetDeviceInfo(device, CL_DEVICE_SINGLE_FP_CONFIG,
+                                sizeof(gFloatFPConfig), &gFloatFPConfig, NULL);
+        test_error_ret(
+            error,
+            "Unable to run INFINITY/NAN tests (unable to get FP_CONFIG bits)",
+            TEST_FAIL);
+
         if (is_extension_available(device, "cl_khr_fp16"))
         {
             cl_int error = clGetDeviceInfo(