testlib: Enable -tickcounter on Apple Silicon

The cycle_p.h header assumes the configure system will set up various
HAVE_FOO defines, which we were not doing. We now selectively use
ARMV8_PMCCNTR_EL0 on Apple Silicon.

This is in line with the upstream change in
https://github.com/FFTW/fftw3/commit/7e92d5

We can't use DEFINES, as CMake doesn't allow function macros in
defines, so we manually use COMPILE_OPTIONS, as we know Clang
supports this.

For Intel the cycle_p.h header already does the right thing based
purely on the compiler-available defines.

Change-Id: Ib3da05c203955a6a377ba0eeb624f1cb430931e1
Reviewed-by:  Alexey Edelev <alexey.edelev@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit fd00d5569e738d2536c05b2fc3ef2517f415b272)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/testlib/CMakeLists.txt

@@ -123,6 +123,12 @@ qt_internal_extend_target(Test CONDITION APPLE
         qappletestlogger.cpp qappletestlogger_p.h
     PUBLIC_LIBRARIES
         ${FWSecurity}
+
+    # cycle_p.h expects the configure system to set up these defines.
+    # Pass through COMPILE_OPTIONS instead of DEFINES, as we know
+    # Clang supports defines with function macros on the command line.
+    COMPILE_OPTIONS
+        "-DHAVE_ARMV8_CNTVCT_EL0='defined(Q_PROCESSOR_ARM)'"
 )
 
 qt_internal_extend_target(Test CONDITION MACOS