Remove PowerPCState::DebugCount.

This value was "helpful" for debugging when the stack got corrupted.
Helpful that if gpr[1](Which is the stack pointer with PPC ABI) is zero then the interpreter would spam huge amounts of annoy text saying that we
managed to get in to a "corrupted" state.
This is incremented every instruction on the interpreter, or every block run on the JIT64....Only if debugging is enabled(JIT64 it is a const
variable)
The message is only outputted when interpreter is used and debugging is enabled.

Source/Core/Core/PowerPC/PowerPC.h

@@ -66,8 +66,6 @@ struct GC_ALIGNED64(PowerPCState)
 
 	u32 sr[16];  // Segment registers.
 
-	u32 DebugCount;
-
 	// special purpose registers - controls quantizers, DMA, and lots of other misc extensions.
 	// also for power management, but we don't care about that.
 	u32 spr[1024];