Jit: Replace "msrBits" with "featureFlags"

Preparation for the next commit.

Source/Core/Core/PowerPC/GDBStub.cpp

@@ -661,6 +661,7 @@ static void WriteRegister()
       break;
     case 65:
       ppc_state.msr.Hex = re32hex(bufptr);
+      PowerPC::MSRUpdated(ppc_state);
       break;
     case 66:
       ppc_state.cr.Set(re32hex(bufptr));