Small optimisations in libhb_core.c

* avoid indirection via function pointers to call SVal__rcinc and SVal__rcdec
* declare these functions inlined
* transform 2 asserts on hot path in conditionally compiled checks
  on CHECK_ZSM

This slightly optimises some perf tests with helgrind



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15212 a5019735-40e9-0310-863c-91ae7b9d1cf9
1 file changed