Remove unsupported code (#1211)

* Remove code for runtime measurement

The GetTime() and associated functions are not fully implemented on
Linux. This functionality is assumed to be untested, or unused at best.

Reduce differences between tests by removing this unnecessary feature.
It can be (re-)implemented later, if desired, once the math_brute_force
component is in better shape.

Signed-off-by: Marco Antognini <marco.antognini@arm.com>

* Coalesce if-statements

Signed-off-by: Marco Antognini <marco.antognini@arm.com>

* Keep else branch

Address comments.

Signed-off-by: Marco Antognini <marco.antognini@arm.com>

test_conformance/math_brute_force/utility.h

@@ -59,8 +59,6 @@ extern cl_mem gOutBuffer2[VECTOR_SIZE_COUNT];
 extern uint32_t gComputeDevices;
 extern uint32_t gSimdSize;
 extern int gSkipCorrectnessTesting;
-extern int gMeasureTimes;
-extern int gReportAverageTimes;
 extern int gForceFTZ;
 extern int gFastRelaxedDerived;
 extern int gWimpyMode;
@@ -91,8 +89,6 @@ float Abs_Error(float test, double reference);
 float Ulp_Error(float test, double reference);
 float Bruteforce_Ulp_Error_Double(double test, long double reference);
 
-uint64_t GetTime(void);
-double SubtractTime(uint64_t endTime, uint64_t startTime);
 int MakeKernel(const char **c, cl_uint count, const char *name, cl_kernel *k,
                cl_program *p, bool relaxedMode);
 int MakeKernels(const char **c, cl_uint count, const char *name,
@@ -123,8 +119,6 @@ static inline double DoubleFromUInt32(uint32_t bits)
 void _LogBuildError(cl_program p, int line, const char *file);
 #define LogBuildError(program) _LogBuildError(program, __LINE__, __FILE__)
 
-#define PERF_LOOP_COUNT 100
-
 // The spec is fairly clear that we may enforce a hard cutoff to prevent
 // premature flushing to zero.
 // However, to avoid conflict for 1.0, we are letting results at TYPE_MIN +