JitArm64: Correctly flush non-dirty immediates

Without this change, non-dirty immediates don't actually get flushed.
This can be a problem if we for instance are flushing all registers in
order to execute an interpreter fallback. If that interpreter fallback
writes to a register that contained a non-dirty immediate, the JIT will
keep using the old value instead of loading the updated value.

Source/Core/Core/PowerPC/JitArm64/JitArm64_RegCache.cpp

@@ -232,10 +232,10 @@ void Arm64GPRCache::FlushRegister(size_t index, bool maintain_state, ARM64Reg tm
         if (allocated_tmp_reg)
           UnlockRegister(tmp_reg);
       }
-
-      if (!maintain_state)
-        reg.Flush();
     }
+
+    if (!maintain_state)
+      reg.Flush();
   }
 }