Compile the cache instruction to nothing.

Was showing up in a few profiles, does nothing currently.

Core/MIPS/PPC/PpcCompLoadStore.cpp

@@ -140,3 +140,9 @@ void Jit::Comp_ITypeMem(MIPSOpcode op) {
 		}
 	}
 }
+
+void Jit::Comp_Cache(MIPSOpcode op) {
+	CONDITIONAL_DISABLE;
+	// TODO: Could use this as a hint, and technically required to handle icache, etc.
+	// But right now Int_Cache does nothing, so let's not even call it.
+}