PassManager: Optimize out CPUID and XGetBV calls

If we const-prop the required functions and leafs then we can directly
encode the CPUID information rather than jumping out of the JIT.
In testing almost all CPUID executions const-prop which function is
getting called. Worst case that I found was only 85% const-prop rate.

This isn't quite 100% optimal since we need to call the RCLSE and
Constprop passes after we optimize these, which would remove some
redundant moves.

Sadly there seems to be a bug in the constprop pass that starts crashing
applications if that is done.
Easily enough tested by running Half-Life 2 and it immediately hitting
SIGILL.

Even without this optimization, this is stil a significant savings since
we aren't jumping out of the JIT anymore for these optimized CPUIDs.

FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp

@@ -1758,7 +1758,9 @@ void OpDispatchBuilder::MOVOffsetOp(OpcodeArgs) {
 }
 
 void OpDispatchBuilder::CPUIDOp(OpcodeArgs) {
-  OrderedNode *Src = LoadSource(GPRClass, Op, Op->Src[0], Op->Flags, -1);
+  const auto GPRSize = CTX->GetGPRSize();
+
+  OrderedNode *Src = LoadSource_WithOpSize(GPRClass, Op, Op->Src[0], GPRSize, Op->Flags, -1);
   OrderedNode *Leaf = LoadGPRRegister(X86State::REG_RCX);
 
   auto Res = _CPUID(Src, Leaf);