RTS_SYMBOLS: added closure_flags (innards-peeking user code may use this); merge to STABLE
SymX(barf) \
SymX(blockAsyncExceptionszh_fast) \
SymX(catchzh_fast) \
+ SymX(closure_flags) \
SymX(cmp_thread) \
- SymX(complementIntegerzh_fast) \
SymX(cmpIntegerzh_fast) \
SymX(cmpIntegerIntzh_fast) \
+ SymX(complementIntegerzh_fast) \
SymX(createAdjustor) \
SymX(decodeDoublezh_fast) \
SymX(decodeFloatzh_fast) \