Record VirtualFree stacks when VirtualAlloc stacks are requested

VirtualFree stacks can be used to track down memory leaks if the memory
is freed during shutdown (not true leaks, but you know what I mean).
This change adds VirtualFree to the stack walk flags when VirtualAlloc
is requested. This change also fixes the capitalization of the other
stack walk flags, to match that used by xperf -help stackwalk

UIforETW/UIforETWDlg.cpp

@@ -913,15 +913,16 @@ void CUIforETWDlg::OnBnClickedStarttracing()
 	std::wstring kernelStackWalk;
 	// Record CPU sampling call stacks, from the PROFILE provider
 	if (bSampledStacks_)
-		kernelStackWalk += L"+PROFILE";
+		kernelStackWalk += L"+Profile";
 	// Record context-switch (switch in) and readying-thread (SetEvent, etc.)
 	// call stacks from DISPATCHER provider.
 	if (bCswitchStacks_)
-		kernelStackWalk += L"+CSWITCH+READYTHREAD";
-	// Record VirtualAlloc call stacks from the VIRT_ALLOC provider. Could
-	// also record VirtualFree.
+		kernelStackWalk += L"+CSwitch+ReadyThread";
+	// Record VirtualAlloc call stacks from the VIRT_ALLOC provider. Also
+	// record VirtualFree to allow investigation of memory leaks, even though
+	// WPA fails to display these stacks.
 	if (bVirtualAllocStacks_ || tracingMode_ == kHeapTracingToFile)
-		kernelStackWalk += L"+VirtualAlloc";
+		kernelStackWalk += L"+VirtualAlloc+VirtualFree";
 	// Add in any manually requested call stack flags.
 	if (!extraKernelStacks_.empty())
 		kernelStackWalk += L"+" + extraKernelStacks_;