Check option TR_DisableIProfilerThread instead of iprofiler thread pr…

…esence

In `TR_Options::feLatePostProcess()` we want to disable the
`TR_UseIdleTime` option bit if we don't want to run with
an IProfiler thread. Currently this is done by checking the
presence of the Iprofiler thread. The problem is that the
IProfiler thread is created much later so our query will
always return `false`.
This commit replaces the check on the IProfiler thread with
a check on the `TR_DisableIProfilerThread` option bit.

Signed-off-by: Marius Pirvu <[email protected]>

runtime/compiler/control/J9Options.cpp

@@ -3425,8 +3425,7 @@ bool J9::Options::feLatePostProcess(void * base, TR::OptionSet * optionSet)
    // The exploitation of idle time is done by a tracking mechanism done
    // on the IProfiler thread. If this thread does not exist, then we
    // must turn this feature off to avoid allocating a useless hashtable
-   TR_IProfiler *iProfiler = vm->getIProfiler();
-   if (!iProfiler || !iProfiler->getIProfilerThread())
+   if (self()->getOption(TR_DisableIProfilerThread))
       self()->setOption(TR_UseIdleTime, false);
 
    // If NoResumableTrapHandler is set, disable packed decimal intrinsics inlining because